diff options
Diffstat (limited to 'kernel/l0/kmain.c')
| -rw-r--r-- | kernel/l0/kmain.c | 40 |
1 files changed, 39 insertions, 1 deletions
diff --git a/kernel/l0/kmain.c b/kernel/l0/kmain.c index f07e243..a221b0e 100644 --- a/kernel/l0/kmain.c +++ b/kernel/l0/kmain.c @@ -13,6 +13,19 @@ void breakpoint_handler(registers_t *regs) { dbg_printf("Breakpoint! (int3)\n"); BOCHS_BREAKPOINT; } + +void test_pf_handler(pagedir_t *pd, region_info_t *i, size_t addr) { + dbg_printf("0x%p", addr); + + uint32_t f = frame_alloc(1); + if (f == 0) PANIC("Out Of Memory"); + dbg_printf(" -> %i", f); + + int error = pd_map_page(addr, f, 1); + if (error) PANIC("Could not map frame (OOM)"); +} + +extern char k_end_addr; // defined in linker script : 0xC0000000 void kmain(struct multiboot_info_t *mbd, int32_t mb_magic) { dbglog_setup(); @@ -35,7 +48,7 @@ void kmain(struct multiboot_info_t *mbd, int32_t mb_magic) { // used for allocation of data structures before malloc is set up // a pointer to this pointer is passed to the functions that might have // to allocate memory ; they just increment it of the allocated quantity - void* kernel_data_end = (void*)K_END_ADDR; + void* kernel_data_end = (void*)&k_end_addr; frame_init_allocator(total_ram, &kernel_data_end); dbg_printf("kernel_data_end: 0x%p\n", kernel_data_end); @@ -72,6 +85,31 @@ void kmain(struct multiboot_info_t *mbd, int32_t mb_magic) { dbg_printf("Freed region 0x%p\n", s); dbg_print_region_stats(); + // allocate a big region and try to write into it + const size_t n = 1000; + size_t p0 = region_alloc(n * PAGE_SIZE, REGION_T_HW, test_pf_handler); + for (size_t i = 0; i < n; i++) { + uint32_t *x = (uint32_t*)(p0 + i * PAGE_SIZE); + dbg_printf("[%i : ", i); + x[0] = 12; + dbg_printf(" : ."); + x[1] = (i * 20422) % 122; + dbg_printf("]\n", i); + } + // unmap memory + for (size_t i = 0; i < n; i++) { + uint32_t *x = (uint32_t*)(p0 + i * PAGE_SIZE); + ASSERT(x[1] == (i * 20422) % 122); + + size_t f = pd_get_frame((size_t)x); + ASSERT(f != 0); + pd_unmap_page((size_t)x); + + frame_free(f, 1); + } + region_free(s); + + // TODO: // - setup allocator for physical pages (eg: buddy allocator, see OSDev wiki) // - setup allocator for virtual memory space |