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x86: fsp: Reinit the FPU after FSP meminit

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The APL FSP appears to leave the FPU in a bad state in that it has
registers in use. This causes an error when the next FPU operation is
performed.

Work around this by re-resetting the FPU after calling FSP-M. This allows
the freetype console to work correctly.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2020-07-02 21:12:12 -06:00 • committed by Bin Meng
parent 61608f395e
commit 3dada5a1a8
3 changed files with 14 additions and 0 deletions
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8
arch/x86/include/asm/u-boot-x86.h
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@ -43,6 +43,14 @@ int x86_cpu_reinit_f(void);
*/
int x86_cpu_init_tpl(void);
/**
* cpu_reinit_fpu() - Reinit the FPU if something is wrong with it
*
* The FSP-M code can leave registers in use in the FPU. This functions reinits
* it so that the FPU can be used safely
*/
void cpu_reinit_fpu(void);
int cpu_init_f(void);
void setup_gdt(struct global_data *id, u64 *gdt_addr);
/*