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mm: add page-granular kmalloc/kfree heap over the PMM

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This commit is contained in:
Pierre-Emmanuel Gob. 2026-10-07 16:29:34 +02:00
parent 5077695c70
commit 919fba989e
4 changed files with 296 additions and 2 deletions
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44
kernel/core/kmain.c
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@ -21,6 +21,7 @@
#include "idt.h"
#include "keyboard.h"
#include "klog.h"
#include "kmalloc.h"
#include "pic.h"
#include "pit.h"
#include "pmm.h"
@ -113,6 +114,49 @@ void kmain(void)
klog_dec(pmm_usable_count() - pmm_free_count());
klog_end();
/* Heap self-test. init, then alloc/write/free churn to prove the
* free-list split and re-insert paths work before interrupts go
* live. Runs with IF=0, polling console only. */
kmalloc_init();
{
uint8_t *a = kmalloc(100);
uint8_t *b = kmalloc(5000); /* spans 2 frames */
uint8_t *c = kmalloc(1);
int ok = 1;
if (a == 0 || b == 0 || c == 0) {
ok = 0;
} else {
uint64_t i;
for (i = 0; i < 100U; i++) {
a[i] = (uint8_t)i;
}
for (i = 0; i < 100U; i++) {
if (a[i] != (uint8_t)i) {
ok = 0;
}
}
b[0] = 0xAAU;
b[4999] = 0x55U;
if (b[0] != 0xAAU || b[4999] != 0x55U) {
ok = 0;
}
}
kfree(a);
kfree(b);
kfree(c);
kfree(0); /* NULL must be a no-op */
klog_begin("kmalloc");
klog_str("self-test ");
klog_str(ok != 0 ? "ok" : "FAILED");
klog_str(", free frames ");
klog_dec(kmalloc_free_frames());
klog_str(", used frames ");
klog_dec(kmalloc_used_frames());
klog_end();
}
/* Explicit opt-in for the two live lines; idempotent even though
* keyboard_init already unmasked IRQ1. */
pic_unmask(0);