erebion/coreboot
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

We need a way to find out where our stack and our global variables are

Browse source 
at any given moment. The code is generic enough to handle this in a
processor-specific way behind the scenes if needed.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Ronald G. Minnich <rminnich@gmail.com>


git-svn-id: svn://coreboot.org/repository/coreboot-v3@933 f3766cd6-281f-0410-b1cd-43a5c92072e9
This commit is contained in:
Carl-Daniel Hailfinger 2008-10-16 03:03:33 +00:00
commit 8b1b420e6b
2 changed files with 18 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

14
arch/x86/stage1.c
View file

@ -71,11 +71,21 @@ void init_archive(struct mem_file *archive)
/*
* The name is slightly misleading because this is the initial stack pointer,
* not the address of the first element on the stack.
* NOTE: This function is very processor specific.
*/
void *bottom_of_stack(void)
{
/* -4 because CONFIG_CARBASE + CONFIG_CARSIZE - 4 is initial %esp */
return (void *)(CONFIG_CARBASE + CONFIG_CARSIZE - 4);
u32 onstack = (u32)&onstack;
/* Check whether the variable onstack is inside the CAR stack area.
* If it is, assume we're still in CAR or the stack has not moved.
* Otherwise return initial %esp for the RAM-based stack location.
*/
if ((onstack >= CAR_STACK_BASE - CAR_STACK_SIZE) &&
(onstack < CAR_STACK_BASE))
return (void *)CAR_STACK_BASE;
/* OK, so current %esp is not inside the CAR stack area. */
return (void *)RAM_STACK_BASE;
}
struct global_vars *global_vars(void)

6
include/arch/x86/cpu.h
View file

@ -266,11 +266,17 @@ EXPORT_SYMBOL(bottom_of_stack);
struct global_vars * global_vars(void);
EXPORT_SYMBOL(global_vars);
#define CAR_STACK_BASE (CONFIG_CARBASE + CONFIG_CARSIZE - 4)
#define RAM_STACK_BASE 0x88ffc
#ifdef CONFIG_CONSOLE_BUFFER
#define PRINTK_BUF_SIZE_CAR (CONFIG_CARSIZE / 2)
#define PRINTK_BUF_ADDR_CAR CONFIG_CARBASE
#define PRINTK_BUF_SIZE_RAM 65536
#define PRINTK_BUF_ADDR_RAM 0x90000
#define CAR_STACK_SIZE ((CONFIG_CARSIZE / 2) - 4)
#else
#define CAR_STACK_SIZE (CONFIG_CARSIZE - 4)
#endif
/* resource maps. These started out as special for the K8 but now have more general usage */