mb/qemu-i440fx: refactor fw_cfg logic as separate driver
The fw_cfg device can be used by other qemu boards outside i440fx (and q35, which manually includes the code). Factor out the fw_cfg code as a separate driver that qemu mainboards can enable. Change-Id: I8c5c4cb5f5478abd21aab8e8d0b503db41d81d40 Signed-off-by: Carlos López <carlos.lopez@openchip.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/85673 Reviewed-by: Nicholas Chin <nic.c3.14@gmail.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Carlos López
Matt DeVillier
parent
6979000434
commit
54d6c6b2ab
15 changed files with 23 additions and 13 deletions
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@ -35,3 +35,9 @@ config DRIVERS_EMULATION_QEMU_YRES
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default 600
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depends on LINEAR_FRAMEBUFFER
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depends on DRIVERS_EMULATION_QEMU_BOCHS || DRIVERS_EMULATION_QEMU_CIRRUS
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config DRIVERS_EMULATION_QEMU_FW_CFG
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bool "qemu fw_cfg"
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default n
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help
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qemu fw_cfg driver
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@ -7,3 +7,9 @@ ramstage-$(CONFIG_CONSOLE_QEMU_DEBUGCON) += qemu_debugcon.c
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ramstage-$(CONFIG_DRIVERS_EMULATION_QEMU_BOCHS) += bochs.c
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ramstage-$(CONFIG_DRIVERS_EMULATION_QEMU_CIRRUS) += cirrus.c
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bootblock-$(CONFIG_DRIVERS_EMULATION_QEMU_FW_CFG) += fw_cfg.c
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romstage-$(CONFIG_DRIVERS_EMULATION_QEMU_FW_CFG) += fw_cfg.c
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verstage-$(CONFIG_DRIVERS_EMULATION_QEMU_FW_CFG) += fw_cfg.c
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postcar-$(CONFIG_DRIVERS_EMULATION_QEMU_FW_CFG) += fw_cfg.c
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ramstage-$(CONFIG_DRIVERS_EMULATION_QEMU_FW_CFG) += fw_cfg.c
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538
src/drivers/emulation/qemu/fw_cfg.c
Normal file
538
src/drivers/emulation/qemu/fw_cfg.c
Normal file
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@ -0,0 +1,538 @@
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/* SPDX-License-Identifier: GPL-2.0-only */
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#include <endian.h>
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#include <stdlib.h>
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#include <string.h>
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#include <smbios.h>
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#include <console/console.h>
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#include <arch/io.h>
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#include <acpi/acpi.h>
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#include <commonlib/endian.h>
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#include <device/fw_cfg.h>
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#include <device/fw_cfg_if.h>
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#define FW_CFG_PORT_CTL 0x0510
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#define FW_CFG_PORT_DATA 0x0511
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#define FW_CFG_DMA_ADDR_HIGH 0x0514
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#define FW_CFG_DMA_ADDR_LOW 0x0518
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static int fw_cfg_detected;
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static uint8_t fw_ver;
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static void fw_cfg_dma(int control, void *buf, int len);
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static int fw_cfg_present(void)
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{
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static const char qsig[] = "QEMU";
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unsigned char sig[FW_CFG_SIG_SIZE];
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int detected = 0;
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if (fw_cfg_detected == 0) {
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fw_cfg_get(FW_CFG_SIGNATURE, sig, sizeof(sig));
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detected = memcmp(sig, qsig, FW_CFG_SIG_SIZE) == 0;
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printk(BIOS_INFO, "QEMU: firmware config interface %s\n",
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detected ? "detected" : "not found");
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if (detected) {
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fw_cfg_get(FW_CFG_ID, &fw_ver, sizeof(fw_ver));
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printk(BIOS_INFO, "Firmware config version id: %d\n", fw_ver);
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}
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fw_cfg_detected = detected + 1;
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}
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return fw_cfg_detected - 1;
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}
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static void fw_cfg_select(uint16_t entry)
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{
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if (fw_ver & FW_CFG_VERSION_DMA)
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fw_cfg_dma(FW_CFG_DMA_CTL_SELECT | entry << 16, NULL, 0);
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else
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outw(entry, FW_CFG_PORT_CTL);
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}
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static void fw_cfg_read(void *dst, int dstlen)
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{
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if (fw_ver & FW_CFG_VERSION_DMA)
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fw_cfg_dma(FW_CFG_DMA_CTL_READ, dst, dstlen);
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else
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insb(FW_CFG_PORT_DATA, dst, dstlen);
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}
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void fw_cfg_get(uint16_t entry, void *dst, int dstlen)
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{
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fw_cfg_select(entry);
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fw_cfg_read(dst, dstlen);
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}
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static int fw_cfg_find_file(FWCfgFile *file, const char *name)
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{
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uint32_t count = 0;
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fw_cfg_select(FW_CFG_FILE_DIR);
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fw_cfg_read(&count, sizeof(count));
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count = be32_to_cpu(count);
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for (int i = 0; i < count; i++) {
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fw_cfg_read(file, sizeof(*file));
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if (strcmp(file->name, name) == 0) {
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file->size = be32_to_cpu(file->size);
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file->select = be16_to_cpu(file->select);
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printk(BIOS_INFO, "QEMU: firmware config: Found '%s'\n", name);
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return 0;
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}
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}
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printk(BIOS_INFO, "QEMU: firmware config: Couldn't find '%s'\n", name);
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return -1;
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}
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int fw_cfg_check_file(FWCfgFile *file, const char *name)
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{
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if (!fw_cfg_present())
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return -1;
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return fw_cfg_find_file(file, name);
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}
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static int fw_cfg_e820_select(uint32_t *size)
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{
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FWCfgFile file;
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if (!fw_cfg_present() || fw_cfg_find_file(&file, "etc/e820"))
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return -1;
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fw_cfg_select(file.select);
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*size = file.size;
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return 0;
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}
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static int fw_cfg_e820_read(FwCfgE820Entry *entry, uint32_t *size,
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uint32_t *pos)
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{
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if (*pos + sizeof(*entry) > *size)
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return -1;
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fw_cfg_read(entry, sizeof(*entry));
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*pos += sizeof(*entry);
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return 0;
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}
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/* returns tolud on success or 0 on failure */
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uintptr_t fw_cfg_tolud(void)
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{
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FwCfgE820Entry e;
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uint64_t top = 0;
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uint32_t size = 0, pos = 0;
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if (fw_cfg_e820_select(&size) == 0) {
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while (!fw_cfg_e820_read(&e, &size, &pos)) {
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uint64_t limit = e.address + e.length;
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if (e.type == 1 && limit < 4ULL * GiB && limit > top)
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top = limit;
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}
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}
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return (uintptr_t)top;
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}
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int fw_cfg_max_cpus(void)
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{
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unsigned short max_cpus;
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if (!fw_cfg_present())
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return 0;
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fw_cfg_get(FW_CFG_MAX_CPUS, &max_cpus, sizeof(max_cpus));
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return max_cpus;
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}
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/* ---------------------------------------------------------------------- */
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/*
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* Starting with release 1.7 qemu provides ACPI tables via fw_cfg.
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* Main advantage is that new (virtual) hardware which needs acpi
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* support JustWorks[tm] without having to patch & update the firmware
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* (seabios, coreboot, ...) accordingly.
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*
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* Qemu provides a etc/table-loader file with instructions for the
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* firmware:
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* - A "load" instruction to fetch ACPI data from fw_cfg.
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* - A "pointer" instruction to patch a pointer. This is needed to
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* get table-to-table references right, it is basically a
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* primitive dynamic linker for ACPI tables.
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* - A "checksum" instruction to generate ACPI table checksums.
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*
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* If a etc/table-loader file is found we'll go try loading the acpi
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* tables from fw_cfg, otherwise we'll fallback to the ACPI tables
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* compiled in.
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*/
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#define BIOS_LINKER_LOADER_FILESZ 56
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struct BiosLinkerLoaderEntry {
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uint32_t command;
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union {
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/*
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* COMMAND_ALLOCATE - allocate a table from @alloc.file
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* subject to @alloc.align alignment (must be power of 2)
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* and @alloc.zone (can be HIGH or FSEG) requirements.
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*
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* Must appear exactly once for each file, and before
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* this file is referenced by any other command.
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*/
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struct {
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char file[BIOS_LINKER_LOADER_FILESZ];
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uint32_t align;
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uint8_t zone;
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} alloc;
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/*
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* COMMAND_ADD_POINTER - patch the table (originating from
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* @dest_file) at @pointer.offset, by adding a pointer to the table
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* originating from @src_file. 1,2,4 or 8 byte unsigned
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* addition is used depending on @pointer.size.
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*/
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struct {
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char dest_file[BIOS_LINKER_LOADER_FILESZ];
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char src_file[BIOS_LINKER_LOADER_FILESZ];
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uint32_t offset;
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uint8_t size;
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} pointer;
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/*
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* COMMAND_ADD_CHECKSUM - calculate checksum of the range specified by
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* @cksum_start and @cksum_length fields,
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* and then add the value at @cksum.offset.
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* Checksum simply sums -X for each byte X in the range
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* using 8-bit math.
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*/
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struct {
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char file[BIOS_LINKER_LOADER_FILESZ];
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uint32_t offset;
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uint32_t start;
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uint32_t length;
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} cksum;
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/* padding */
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char pad[124];
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};
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} __packed;
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typedef struct BiosLinkerLoaderEntry BiosLinkerLoaderEntry;
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enum {
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BIOS_LINKER_LOADER_COMMAND_ALLOCATE = 0x1,
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BIOS_LINKER_LOADER_COMMAND_ADD_POINTER = 0x2,
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BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM = 0x3,
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};
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enum {
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BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH = 0x1,
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BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG = 0x2,
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};
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unsigned long fw_cfg_acpi_tables(unsigned long start)
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{
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FWCfgFile f;
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BiosLinkerLoaderEntry *s;
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unsigned long *addrs, current;
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uint8_t *ptr;
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int i, j, src, dst, max;
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if (fw_cfg_check_file(&f, "etc/table-loader"))
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return 0;
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printk(BIOS_DEBUG, "QEMU: found ACPI tables in fw_cfg.\n");
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max = f.size / sizeof(*s);
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s = malloc(f.size);
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addrs = malloc(max * sizeof(*addrs));
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fw_cfg_get(f.select, s, f.size);
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current = start;
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for (i = 0; i < max && s[i].command != 0; i++) {
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void *cksum_data;
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uint32_t cksum;
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uint32_t addr4;
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uint64_t addr8;
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switch (s[i].command) {
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case BIOS_LINKER_LOADER_COMMAND_ALLOCATE:
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current = ALIGN_UP(current, s[i].alloc.align);
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if (fw_cfg_check_file(&f, s[i].alloc.file))
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goto err;
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printk(BIOS_DEBUG, "QEMU: loading \"%s\" to 0x%lx (len %d)\n",
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s[i].alloc.file, current, f.size);
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fw_cfg_get(f.select, (void *)current, f.size);
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addrs[i] = current;
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current += f.size;
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break;
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case BIOS_LINKER_LOADER_COMMAND_ADD_POINTER:
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src = -1; dst = -1;
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for (j = 0; j < i; j++) {
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if (s[j].command != BIOS_LINKER_LOADER_COMMAND_ALLOCATE)
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continue;
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if (strcmp(s[j].alloc.file, s[i].pointer.dest_file) == 0)
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dst = j;
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if (strcmp(s[j].alloc.file, s[i].pointer.src_file) == 0)
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src = j;
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}
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if (src == -1 || dst == -1)
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goto err;
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switch (s[i].pointer.size) {
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case 4:
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ptr = (uint8_t *)addrs[dst];
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ptr += s[i].pointer.offset;
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addr4 = read_le32(ptr);
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addr4 += addrs[src];
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write_le32(ptr, addr4);
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break;
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case 8:
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ptr = (uint8_t *)addrs[dst];
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ptr += s[i].pointer.offset;
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addr8 = read_le64(ptr);
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addr8 += addrs[src];
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write_le64(ptr, addr8);
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break;
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default:
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/*
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* Should not happen. ACPI knows 1 and 2 byte ptrs
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* too, but we are operating with 32bit offsets which
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* would simply not fit in there ...
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*/
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printk(BIOS_DEBUG, "QEMU: acpi: unimplemented ptr size %d\n",
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s[i].pointer.size);
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goto err;
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}
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break;
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case BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM:
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dst = -1;
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for (j = 0; j < i; j++) {
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if (s[j].command != BIOS_LINKER_LOADER_COMMAND_ALLOCATE)
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continue;
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if (strcmp(s[j].alloc.file, s[i].cksum.file) == 0)
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dst = j;
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}
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if (dst == -1)
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goto err;
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ptr = (uint8_t *)(addrs[dst] + s[i].cksum.offset);
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cksum_data = (void *)(addrs[dst] + s[i].cksum.start);
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cksum = acpi_checksum(cksum_data, s[i].cksum.length);
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write_le8(ptr, cksum);
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break;
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default:
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printk(BIOS_DEBUG, "QEMU: acpi: unknown script cmd 0x%x @ %p\n",
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s[i].command, s+i);
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goto err;
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};
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}
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printk(BIOS_DEBUG, "QEMU: loaded ACPI tables from fw_cfg.\n");
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free(s);
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free(addrs);
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return ALIGN_UP(current, 16);
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err:
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printk(BIOS_DEBUG, "QEMU: loading ACPI tables from fw_cfg failed.\n");
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free(s);
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free(addrs);
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return 0;
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}
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/* ---------------------------------------------------------------------- */
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/* pick up smbios information from fw_cfg */
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#if CONFIG(GENERATE_SMBIOS_TABLES)
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static const char *type1_manufacturer;
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static const char *type1_product_name;
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static const char *type1_version;
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static const char *type1_serial_number;
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static const char *type1_family;
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static u8 type1_uuid[16];
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static void fw_cfg_smbios_init(void)
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{
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static int done = 0;
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uint16_t i, count = 0;
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FwCfgSmbios entry;
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char *buf;
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if (done)
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return;
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done = 1;
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fw_cfg_get(FW_CFG_SMBIOS_ENTRIES, &count, sizeof(count));
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for (i = 0; i < count; i++) {
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fw_cfg_read(&entry, sizeof(entry));
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buf = malloc(entry.length - sizeof(entry));
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fw_cfg_read(buf, entry.length - sizeof(entry));
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if (entry.headertype == SMBIOS_FIELD_ENTRY &&
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entry.tabletype == 1) {
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switch (entry.fieldoffset) {
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case offsetof(struct smbios_type1, manufacturer):
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type1_manufacturer = strdup(buf);
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break;
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case offsetof(struct smbios_type1, product_name):
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type1_product_name = strdup(buf);
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break;
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case offsetof(struct smbios_type1, version):
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type1_version = strdup(buf);
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break;
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case offsetof(struct smbios_type1, serial_number):
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type1_serial_number = strdup(buf);
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break;
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case offsetof(struct smbios_type1, family):
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type1_family = strdup(buf);
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break;
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case offsetof(struct smbios_type1, uuid):
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memcpy(type1_uuid, buf, 16);
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break;
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}
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}
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free(buf);
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}
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}
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static unsigned long smbios_next(unsigned long current)
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{
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struct smbios_header *header;
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int l, count = 0;
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char *s;
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header = (void *)current;
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current += header->length;
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for (;;) {
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s = (void *)current;
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l = strlen(s);
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if (!l)
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return current + (count ? 1 : 2);
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current += l + 1;
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count++;
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}
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}
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/*
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* Starting with version 2.1 qemu provides a full set of smbios tables
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* for the virtual hardware emulated, except type 0 (bios information).
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*
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* What we are going to do here is find the type0 table, keep it, and
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* override everything else generated by coreboot with the qemu smbios
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* tables.
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*
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* It's a bit hackish, but qemu is a special case (compared to real
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* hardware) and this way we don't need special qemu support in the
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* generic smbios code.
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*/
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unsigned long fw_cfg_smbios_tables(int *handle, unsigned long *current)
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{
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FWCfgFile f;
|
||||
struct smbios_header *header;
|
||||
unsigned long start, end;
|
||||
int ret, i, count = 1;
|
||||
char *str;
|
||||
|
||||
if (fw_cfg_check_file(&f, "etc/smbios/smbios-tables"))
|
||||
return 0;
|
||||
|
||||
printk(BIOS_DEBUG, "QEMU: found smbios tables in fw_cfg (len %d).\n", f.size);
|
||||
|
||||
/*
|
||||
* Search backwards for "coreboot" (first string in type0 table,
|
||||
* see src/arch/x86/boot/smbios.c), then find type0 table.
|
||||
*/
|
||||
for (i = 0; i < 16384; i++) {
|
||||
str = (char*)(*current - i);
|
||||
if (strcmp(str, "coreboot") == 0)
|
||||
break;
|
||||
}
|
||||
if (i == 16384)
|
||||
return 0;
|
||||
i += sizeof(struct smbios_type0) - 2;
|
||||
header = (struct smbios_header *)(*current - i);
|
||||
if (header->type != SMBIOS_BIOS_INFORMATION || header->handle != 0)
|
||||
return 0;
|
||||
printk(BIOS_DEBUG, "QEMU: coreboot type0 table found at 0x%lx.\n",
|
||||
*current - i);
|
||||
start = smbios_next(*current - i);
|
||||
|
||||
/*
|
||||
* Fetch smbios tables from qemu, go find the end marker.
|
||||
* We'll exclude the end marker as coreboot will add one.
|
||||
*/
|
||||
printk(BIOS_DEBUG, "QEMU: loading smbios tables to 0x%lx\n", start);
|
||||
fw_cfg_get(f.select, (void *)start, f.size);
|
||||
end = start;
|
||||
do {
|
||||
header = (struct smbios_header *)end;
|
||||
if (header->type == SMBIOS_END_OF_TABLE)
|
||||
break;
|
||||
end = smbios_next(end);
|
||||
count++;
|
||||
} while (end < start + f.size);
|
||||
|
||||
/* final fixups. */
|
||||
ret = end - *current;
|
||||
*current = end;
|
||||
*handle = count;
|
||||
return ret;
|
||||
}
|
||||
|
||||
const char *smbios_mainboard_manufacturer(void)
|
||||
{
|
||||
fw_cfg_smbios_init();
|
||||
return type1_manufacturer ?: CONFIG_MAINBOARD_SMBIOS_MANUFACTURER;
|
||||
}
|
||||
|
||||
const char *smbios_mainboard_product_name(void)
|
||||
{
|
||||
fw_cfg_smbios_init();
|
||||
return type1_product_name ?: CONFIG_MAINBOARD_SMBIOS_PRODUCT_NAME;
|
||||
}
|
||||
|
||||
const char *smbios_mainboard_version(void)
|
||||
{
|
||||
fw_cfg_smbios_init();
|
||||
return type1_version ?: CONFIG_MAINBOARD_VERSION;
|
||||
}
|
||||
|
||||
const char *smbios_mainboard_serial_number(void)
|
||||
{
|
||||
fw_cfg_smbios_init();
|
||||
return type1_serial_number ?: CONFIG_MAINBOARD_SERIAL_NUMBER;
|
||||
}
|
||||
|
||||
void smbios_system_set_uuid(u8 *uuid)
|
||||
{
|
||||
fw_cfg_smbios_init();
|
||||
memcpy(uuid, type1_uuid, 16);
|
||||
}
|
||||
#endif /* CONFIG(GENERATE_SMBIOS_TABLES) */
|
||||
|
||||
/*
|
||||
* Configure DMA setup
|
||||
*/
|
||||
|
||||
static void fw_cfg_dma(int control, void *buf, int len)
|
||||
{
|
||||
volatile FwCfgDmaAccess dma;
|
||||
uintptr_t dma_desc_addr;
|
||||
uint32_t dma_desc_addr_hi, dma_desc_addr_lo;
|
||||
|
||||
dma.control = be32_to_cpu(control);
|
||||
dma.length = be32_to_cpu(len);
|
||||
dma.address = be64_to_cpu((uintptr_t)buf);
|
||||
|
||||
dma_desc_addr = (uintptr_t)&dma;
|
||||
dma_desc_addr_lo = (uint32_t)(dma_desc_addr & 0xFFFFFFFFU);
|
||||
dma_desc_addr_hi = sizeof(uintptr_t) > sizeof(uint32_t)
|
||||
? (uint32_t)(dma_desc_addr >> 32) : 0;
|
||||
|
||||
// Skip writing high half if unnecessary.
|
||||
if (dma_desc_addr_hi)
|
||||
outl(be32_to_cpu(dma_desc_addr_hi), FW_CFG_DMA_ADDR_HIGH);
|
||||
outl(be32_to_cpu(dma_desc_addr_lo), FW_CFG_DMA_ADDR_LOW);
|
||||
|
||||
while (be32_to_cpu(dma.control) & ~FW_CFG_DMA_CTL_ERROR)
|
||||
;
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue