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Improved kernel mmap support

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This commit is contained in:
Thomas Lovén 2022-03-03 14:31:26 +01:00
parent e1b917e4c2
commit 4115a2099b
1 changed files with 14 additions and 4 deletions
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18
src/kernel/memory/kbrk.c
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@ -1,5 +1,7 @@
#include <memory.h>
#include <debug.h>
#include <sys/mman.h>
#include <string.h>
static long _brk = KERNEL_BRK0;
static long _mmap = KERNEL_MMAP;
@ -33,14 +35,22 @@ long k_mmap(
if(fd != -1)
PANIC("Unknown mmap request\n");
long retval = _mmap;
while(length > 0) {
long pos = (flags & MAP_FIXED) ? addr : _mmap;
long retval = pos;
uint64_t p;
while(length >= 0) {
p = pmm_alloc();
vmm_set_page(kernel_P4,
_mmap, pmm_alloc(),
pos, p,
PAGE_GLOBAL | PAGE_WRITE | PAGE_PRESENT
);
_mmap += PAGE_SIZE;
if(flags & MAP_ANONYMOUS) {
memset((void *)pos, 0, PAGE_SIZE);
}
pos += PAGE_SIZE;
length -= PAGE_SIZE;
}
if(!(flags & MAP_FIXED))
_mmap = pos;
return retval;
}