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Fix kernel heap allocation

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This commit is contained in:
Kevin Lange 2013-04-27 22:04:03 -07:00
parent d78f5233d7
commit 71bafd0174
1 changed files with 11 additions and 6 deletions
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17
kernel/mem/mem.c
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@ -245,22 +245,24 @@ paging_install(uint32_t memsize) {
kernel_directory = (page_directory_t *)kvmalloc_p(sizeof(page_directory_t),&phys);
memset(kernel_directory, 0, sizeof(page_directory_t));
uint32_t i = 0;
while (i < placement_pointer + 0x3000) {
for (uintptr_t i = 0; i < placement_pointer + 0x3000; i += 0x1000) {
alloc_frame(get_page(i, 1, kernel_directory), 1, 0);
i += 0x1000;
}
/* XXX VGA TEXT MODE VIDEO MEMORY EXTENSION */
for (uint32_t j = 0xb8000; j < 0xc0000; j += 0x1000) {
for (uintptr_t j = 0xb8000; j < 0xc0000; j += 0x1000) {
alloc_frame(get_page(j, 1, kernel_directory), 0, 1);
}
isrs_install_handler(14, page_fault);
kernel_directory->physical_address = (uintptr_t)kernel_directory->physical_tables;
/* Kernel Heap Space */
for (i = placement_pointer; i < KERNEL_HEAP_INIT; i += 0x1000) {
for (uintptr_t i = placement_pointer; i < KERNEL_HEAP_INIT; i += 0x1000) {
alloc_frame(get_page(i, 1, kernel_directory), 1, 0);
}
/* And preallocate the page entries for all the rest of the kernel heap as well */
for (uintptr_t i = KERNEL_HEAP_INIT; i < KERNEL_HEAP_END; i += 0x1000) {
get_page(i, 1, kernel_directory);
}
current_directory = clone_directory(kernel_directory);
switch_page_directory(kernel_directory);
@ -384,9 +386,12 @@ sbrk(
uintptr_t address = heap_end;
if (heap_end + increment > KERNEL_HEAP_INIT) {
debug_print(NOTICE, "Hit the end of available kernel heap, going to allocate more (at 0x%x, want to be at 0x%x)", heap_end, heap_end + increment);
for (uintptr_t i = heap_end; i < heap_end + increment; i += 0x1000) {
alloc_frame(get_page(i, 1, kernel_directory), 1, 0);
debug_print(INFO, "Allocating frame at 0x%x...", i);
alloc_frame(get_page(i, 0, kernel_directory), 1, 0);
}
debug_print(INFO, "Done.");
}
heap_end += increment;