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Changes from the reorg branch

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Add CR4 options: global pages, FXSAVE, PCIDs
Better page manager page-in flags
Remove obsolete rflags-saving in create_process
This commit is contained in:
Justin C. Miller
2018-09-05 22:26:23 -07:00
parent 2fb92e8592
commit dc40c2f6ad
3 changed files with 15 additions and 8 deletions
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8
src/kernel/memory_bootstrap.cpp
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@@ -429,6 +429,14 @@ memory_initialize(const void *memory_map, size_t map_length, size_t desc_length)
__asm__ __volatile__ ( "mov %%cr3, %0" : "=r" (cr3) );
page_table *tables = reinterpret_cast<page_table *>(cr3 & ~0xfffull);
// We'll need to make sure the options we want in CR4 are set
uint64_t cr4;
__asm__ __volatile__ ( "mov %%cr4, %0" : "=r" (cr4) );
cr4 |= 0x00080; // Enable global pages
cr4 |= 0x00200; // Enable FXSAVE/FXRSTOR
cr4 |= 0x20000; // Enable PCIDs
__asm__ __volatile__ ( "mov %0, %%cr4" :: "r" (cr4) );
// Now go through EFi's memory map and find a region of scratch space.
const unsigned want_pages = 32;
uint64_t free_region_start_phys =