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Kernel: Move paging code to a helper

This commit is contained in:
Bananymous 2022-12-28 19:01:01 +02:00
parent 06a4ef1d87
commit 267367333e
1 changed files with 16 additions and 23 deletions
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39
kernel/arch/i386/Paging.cpp
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@ -28,46 +28,39 @@ namespace Paging
); );
} }
void MapFramebuffer(uint32_t address) static void MapPDE(uint32_t address, uint32_t* pt)
{ {
if ((address & 0xffc00000) != address)
Kernel::panic("Trying to map non 4 MiB aligned address");
uint32_t pd_index = address >> 22; uint32_t pd_index = address >> 22;
if (!(s_page_directory[pd_index] & (1 << 0))) if (!(s_page_directory[pd_index] & (1 << 0)))
{ {
// Identity map the whole page table
for (uint32_t i = 0; i < 1024; i++) for (uint32_t i = 0; i < 1024; i++)
s_page_table_framebuffer[i] = address | (i << 12) | 0x03; pt[i] = address | (i << 12) | 0x03;
s_page_directory[pd_index] = (uint32_t)s_page_table_framebuffer | 0x03; // Set the pde to point to page table
s_page_directory[pd_index] = (uint32_t)pt | 0x03;
// Flush TLB
for (uint32_t i = 0; i < 1024; i++) for (uint32_t i = 0; i < 1024; i++)
asm volatile("invlpg (%0)" :: "r" (address | (i << 12)) : "memory"); asm volatile("invlpg (%0)" :: "r" (address | (i << 12)) : "memory");
} }
} }
void MapFramebuffer(uint32_t address)
{
MapPDE(address, s_page_table_framebuffer);
}
void MapRSDP(uint32_t address) void MapRSDP(uint32_t address)
{ {
uint32_t pd_index = address >> 22; MapPDE(address, s_page_table_rsdp);
if (!(s_page_directory[pd_index] & (1 << 0)))
{
for (uint32_t i = 0; i < 1024; i++)
s_page_table_rsdp[i] = address | (i << 12) | 0x03;
s_page_directory[pd_index] = (uint32_t)s_page_table_rsdp | 0x03;
for (uint32_t i = 0; i < 1024; i++)
asm volatile("invlpg (%0)" :: "r" (address | (i << 12)) : "memory");
}
} }
void MapAPIC(uint32_t address) void MapAPIC(uint32_t address)
{ {
uint32_t pd_index = address >> 22; MapPDE(address, s_page_table_apic);
if (!(s_page_directory[pd_index] & (1 << 0)))
{
for (uint32_t i = 0; i < 1024; i++)
s_page_table_apic[i] = address | (i << 12) | 0x03;
s_page_directory[pd_index] = (uint32_t)s_page_table_apic | 0x03;
for (uint32_t i = 0; i < 1024; i++)
asm volatile("invlpg (%0)" :: "r" (address | (i << 12)) : "memory");
}
} }
} }