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Improved kernel memory usage

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Moved base linear address to 0xFF800000
Kernel only reserves the page frames it actually needs
Memory for multiboot2 headers is freed
Video memory and APIC registers are dynamically mapped into linear addresses
This commit is contained in:
ngiddings
2021-04-17 03:45:45 -05:00
parent b141582f40
commit 961139df9e
10 changed files with 91 additions and 57 deletions
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5
src/x86/apic.c
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@@ -1,4 +1,5 @@
#include "mmgr.h"
#include "allocator.h"
#include "apic.h"
#include "msr.h"
#include "stdio.h"
@@ -33,9 +34,9 @@ void apic_enable(struct page_stact_t *page_stack)
);
struct msr_apic_base_t msr;
read_msr(MSR_APIC_BASE, (uint64_t*)&msr);
map_page(page_stack, &_kernel_end, msr.apic_base << 12, PAGE_RW);
apic_registers = (struct apic_registers_t*)allocate_from_bottom(page_size);
map_page(page_stack, apic_registers, msr.apic_base << 12, PAGE_RW);
printf("MSR_APIC_BASE: %016x\n", *((uint32_t*)&msr));
apic_registers = (struct apic_registers_t*)&_kernel_end;
apic_registers->spurious_iv.value = apic_registers->spurious_iv.value | 0x100;
}