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PMM finally works??

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Tom-on
2025-04-03 15:40:01 +02:00
parent dd7e621640
commit 5d7a4d790f
2 changed files with 19 additions and 5 deletions
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kernel/src/kernel.c
+1 -1
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@@ -22,7 +22,7 @@ void kmain(void* ptr, uint32_t magic) {
tty_puts("kern.\n\n"); tty_puts("kern.\n\n");
// Memory manager init // Memory manager init
//pmm_init(); pmm_init();
//vmm_init(); //vmm_init();
gdt_init(); gdt_init();
kernel/src/pmm.c
+18 -4
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@@ -4,7 +4,7 @@
#include <pmm.h> #include <pmm.h>
// Bitmap & helpers // Bitmap & helpers
uint32_t* bitmap = NULL; uint32_t* bitmap;
#define SET_BLOCK(_b) bitmap[(_b) / 32] |= (1 << ((_b) % 32)) #define SET_BLOCK(_b) bitmap[(_b) / 32] |= (1 << ((_b) % 32))
#define USET_BLOCK(_b) bitmap[(_b) / 32] &= ~(1 << ((_b) % 32)) #define USET_BLOCK(_b) bitmap[(_b) / 32] &= ~(1 << ((_b) % 32))
#define TEST_BLOCK(_b) ((bitmap[(_b) % 32] & (1 << ((_b) % 32))) ? 1 : 0) #define TEST_BLOCK(_b) ((bitmap[(_b) % 32] & (1 << ((_b) % 32))) ? 1 : 0)
@@ -17,10 +17,24 @@ int pmm_init(void) {
size_t totalmem = (bootloader.memLower + bootloader.memUpper) * 1024; size_t totalmem = (bootloader.memLower + bootloader.memUpper) * 1024;
maxBlocks = totalmem / PMM_BS; maxBlocks = totalmem / PMM_BS;
usedBlocks = maxBlocks; usedBlocks = maxBlocks;
bitmap = NULL;
// TODO: // Find enough space for the bitmap
bitmap = (uint32_t*)NULL; struct boot_memmap* mmap;
memset(bitmap, 0, maxBlocks / PMM_BPB); for (size_t i = 0; i < bootloader.memmapLen; i++) {
mmap = &bootloader.memmap[i];
if (mmap->type != BOOT_MMAP_AVAILABLE ||
mmap->size < maxBlocks / PMM_BPB) continue;
bitmap = (uint32_t*)mmap->base;
break;
}
if (bitmap == NULL) return 1;
// Set all blocks as used
memset(bitmap, 1, maxBlocks / PMM_BPB);
return 0; return 0;
} }