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x86: Add a way to reinit the cpu

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We cannot init the CPU fully both than once during a boot. Add a new
function which can be called to figure out the CPU identity, but which
does not change anything. For x86_64, this is empty for now.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2019-04-25 21:58:42 -06:00 • committed by Bin Meng
parent 7b14023880
commit c0069e9a8a
3 changed files with 91 additions and 41 deletions
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20
arch/x86/include/asm/u-boot-x86.h
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@ -13,7 +13,27 @@ extern char gdt_rom[];
/* cpu/.../cpu.c */
int arch_cpu_init(void);
/**
* x86_cpu_init_f() - Set up basic features of the x86 CPU
*
* 0 on success, -ve on error
*/
int x86_cpu_init_f(void);
/**
* x86_cpu_reinit_f() - Set up the CPU a second time
*
* Once cpu_init_f() has been called (e.g. in SPL) we should not call it
* again (e.g. in U-Boot proper) since it sets up the state from scratch.
* Call this function in later phases of U-Boot instead. It reads the CPU
* identify so that CPU functions can be used correctly, but does not change
* anything.
*
* @return 0 (indicating success, to mimic cpu_init_f())
*/
int x86_cpu_reinit_f(void);
int cpu_init_f(void);
void setup_gdt(struct global_data *id, u64 *gdt_addr);
/*