| 53,11 → 53,32 |
|---|
| align 4 |
| proc init_mem |
| |
| mov esi, (PCIe_CONFIG_SPACE-OS_BASE) ; esi will hold total amount of memory |
| mov ecx, 0xC001001A ; Top of Memory MSR |
| xor edi, edi |
| rdmsr |
| mov esi, eax ; esi = total amount of memory |
| mov ecx, 0x0200 |
| .read_mtrr: |
| rdmsr |
| and eax, 0xFFF00000 ; not just bitcleaning |
| jz .next_mtrr ; ignore the main memory and free MTRRs |
| cmp esi, eax |
| jb .next_mtrr ; ignore MMIO blocks |
| mov esi, eax |
| .next_mtrr: |
| add cl, 2 |
| cmp cl, 0x10 |
| jb .read_mtrr |
| |
| mov eax, USER_DMA_SIZE |
| sub esi, eax ; exclude the Global DMA block... |
| and esi, 0xFF800000 ; ...and the hole above it |
| mov eax, esi |
| mov [MEM_AMOUNT-OS_BASE], eax |
| mov [pg_data.mem_amount-OS_BASE], eax ; the true MEMTOP |
| mov [UserDMAaddr-OS_BASE], eax |
| |
| mov edx, esi ; edx will hold maximum allocatable address |
| |
| mov [MEM_AMOUNT-OS_BASE], esi |
| mov [pg_data.mem_amount-OS_BASE], esi |
| shr esi, 12 |
| mov [pg_data.pages_count-OS_BASE], esi ; max number of PTEs ? |
| |