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| author | Freya Murphy <freya@freyacat.org> | 2025-04-03 21:32:00 -0400 |
|---|---|---|
| committer | Freya Murphy <freya@freyacat.org> | 2025-04-03 21:32:00 -0400 |
| commit | 16b7b4c2c008c976ee5948c97a8337d6224c3be9 (patch) | |
| tree | 70f8402c3a2650d72fb174a43f8893a6f415546b /kernel/cpu/fpu.c | |
| parent | fix printf (diff) | |
| download | comus-16b7b4c2c008c976ee5948c97a8337d6224c3be9.tar.gz comus-16b7b4c2c008c976ee5948c97a8337d6224c3be9.tar.bz2 comus-16b7b4c2c008c976ee5948c97a8337d6224c3be9.zip | |
add 64-bit idt/pic and fix paging
Diffstat (limited to 'kernel/cpu/fpu.c')
| -rw-r--r-- | kernel/cpu/fpu.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/cpu/fpu.c b/kernel/cpu/fpu.c new file mode 100644 index 0000000..f2674a7 --- /dev/null +++ b/kernel/cpu/fpu.c @@ -0,0 +1,12 @@ +#include <lib.h> + +#include "fpu.h" + +void fpu_init(void) { + size_t cr4; + uint16_t cw = 0x37F; + __asm__ volatile ("mov %%cr4, %0" : "=r"(cr4)); + cr4 |= 0x200; + __asm__ volatile ("mov %0, %%cr4" :: "r"(cr4)); + __asm__ volatile("fldcw %0" :: "m"(cw)); +} |