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Add initialize_cpu()

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This commit is contained in:
Josh Holtrop 2022-11-05 20:27:48 -04:00
parent d7b12c7896
commit 64190b04cb
1 changed files with 14 additions and 0 deletions
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14
src/hulk/hulk.d
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@ -33,12 +33,26 @@ private __gshared HulkHeader hulk_header = {
HULK_VIRTUAL_FRAMEBUFFER_ADDRESS, /* virt_fb_buffer */
};
private void initialize_cpu()
{
/* 1. Enable SSE. */
/* 1.a. Turn off CR0.EM and turn on CR0.MP. */
write_cr0((read_cr0() & ~CR0_EM) | CR0_MP);
/* 1.b. Set CR4.OSFXSR and CR4.OSXMMEXCPT. */
write_cr4(read_cr4() | CR4_OSFXSR | CR4_OSXMMEXCPT);
/* 2. Enable OSXSAVE. */
// write_cr4(read_cr4() | CR4_OSXSAVE);
/* 3. Enable AVX. */
// xsetbv(0u, xgetbv(0u) | XCR0_X87 | XCR0_SSE | XCR0_AVX);
}
/**
* HULK entry point.
*/
void hulk_start()
{
cli();
initialize_cpu();
gdt.initialize();
idt.initialize();
fb.initialize(cast(uint *)HULK_VIRTUAL_FRAMEBUFFER_ADDRESS, hulk_header.bootinfo.fb.width, hulk_header.bootinfo.fb.height, hulk_header.bootinfo.fb.stride);