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Add support for ram payloads

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This is enabled by CONFIG_RAMPAYLOAD.

The code will look for a ram payload and, if it is found, try
to run it. If the load fails or the payload returns it will
continue with ramstage.

We also include a new payload, linuxcheck, which is intended
to verify that linux can be loaded and run, e.g. as a LinuxBoot
payload. Currently, it fails.

This does not yet work but it makes sense as a foundation on which
to build. For one thing, we need to build at least a few tables
for Linux. The goal for LinuxBoot is to build as few as possible.

To test with linuxcheck (linux is not even close to working):
cd payloads/linuxcheck/
cp x86config  .config
make

cd ../..
make

./build/cbfstool build/coreboot.rom add-payload -n fallback/rampayload -f payloads/linuxcheck/linuxcheck.elf

qemu-system-x86_64 -nographic -m 8192 -bios build/coreboot.rom -monitor /dev/pts/$1 -s

We need to change the payload menu so we can add a rampayload but it's a bit
tricky as written, so that must come later.

Note that I'm still creating a special purpose romselfboot. The idea of
merging romselfboot and selfboot is probably a good idea -- in the future.
I think until we know how this should look, such a merge is premature.

Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>

Change-Id: I8199aae6776f6dee969b370b0e6a41ef96e854d8
clang-formatted-by: Ronald G. Minnich
Reviewed-on: https://review.coreboot.org/28402
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Tested-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
This commit is contained in:
Ronald G. Minnich 2018-08-13 15:24:30 -07:00 • committed by Philipp Deppenwiese
commit 4cea3a19f8
10 changed files with 464 additions and 12 deletions
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16
src/include/program_loading.h
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@ -68,10 +68,10 @@ struct prog {
void *arg;
};
#define PROG_INIT(type_, name_) \
{ \
.type = (type_), \
.name = (name_), \
#define PROG_INIT(type_, name_) \
{ \
.type = (type_), \
.name = (name_), \
}
static inline const char *prog_name(const struct prog *prog)
@ -120,7 +120,7 @@ static inline void *prog_entry_arg(const struct prog *prog)
extern const struct mem_region_device addrspace_32bit;
static inline void prog_memory_init(struct prog *prog, uintptr_t ptr,
size_t size)
size_t size)
{
rdev_chain(&prog->rdev, &addrspace_32bit.rdev, ptr, size);
}
@ -174,8 +174,12 @@ void run_romstage(void);
/* Run ramstage from romstage. */
void run_ramstage(void);
/* Run a prog (stage or payload) from romstage. */
void run_ramprog(void);
/* Determine where stack for ramstage loader is located. */
enum { ROMSTAGE_STACK_CBMEM, ROMSTAGE_STACK_LOW_MEM };
enum { ROMSTAGE_STACK_CBMEM,
ROMSTAGE_STACK_LOW_MEM };
uintptr_t romstage_ram_stack_base(size_t size, int src);
uintptr_t romstage_ram_stack_top(void);
uintptr_t romstage_ram_stack_bottom(void);