100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
#include <stdint.h>
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#include "syscall.h"
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#include "mman.h"
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#include "spinlock/spinlock.h"
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#include "proc/proc.h"
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#include "hal/hal.h"
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#include "pmm/pmm.h"
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#include "util/util.h"
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#include "errors.h"
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#include "sysdefs/mman.h"
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#include "bootinfo/bootinfo.h"
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#include "dlmalloc/malloc.h"
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int32_t SYSCALL5(sys_mman_map, addr1, size1, prot1, flags1, out1) {
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uint8_t *addr = (uint8_t *)addr1;
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size_t size = size1;
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uint64_t prot = prot1;
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uint64_t flags = flags1;
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uint8_t **out = (uint8_t **)out1;
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if (size % HAL_PAGE_SIZE != 0) {
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if (out != NULL) {
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*out = NULL;
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}
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return E_INVALIDARGUMENT;
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}
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size_t pages = _DIV_ROUNDUP(size, HAL_PAGE_SIZE);
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uint8_t *phys = (uint8_t *)pmm_alloc(pages);
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if (phys == NULL) {
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return E_NOMEMORY;
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}
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hal_memset(VIRT(phys), 0, pages * HAL_PAGE_SIZE);
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spinlock_acquire(&PROCS.spinlock);
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Proc *proc = PROCS.current;
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spinlock_release(&PROCS.spinlock);
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uint8_t *virt = NULL;
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if (flags & MMAN_MAP_F_FIXED && addr != NULL) {
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virt = addr;
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} else {
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virt = (uint8_t *)proc->mman_map_base;
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proc->mman_map_base += size;
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}
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uint64_t pflags = HAL_PG_USER | HAL_PG_PRESENT;
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if (prot & MMAN_MAP_PF_RW) {
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pflags |= HAL_PG_RW;
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}
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hal_vmm_map_range(VIRT(proc->platformdata.cr3), virt, phys, size, pflags);
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VasRange *range = dlmalloc(sizeof(*range));
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range->virtstart = virt;
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range->physstart = phys;
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range->size = size * HAL_PAGE_SIZE;
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range->pgflags = pflags;
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LL_APPEND(proc->vas, range);
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if (out != NULL) {
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*out = virt;
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}
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return E_OK;
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}
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int32_t SYSCALL1(sys_mman_unmap, addr1) {
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uint8_t *addr = (uint8_t *)addr1;
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if (addr == NULL) {
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return E_INVALIDARGUMENT;
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}
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spinlock_acquire(&PROCS.spinlock);
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Proc *proc = PROCS.current;
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spinlock_release(&PROCS.spinlock);
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uint8_t *virt = NULL;
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VasRange *tofree = NULL;
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VasRange *range = proc->vas;
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while (range) {
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if (range->virtstart == addr) {
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tofree = range;
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break;
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}
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range = range->next;
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}
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if (tofree == NULL) {
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return E_INVALIDARGUMENT;
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}
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hal_vmm_unmap_range(VIRT(proc->platformdata.cr3), tofree->virtstart, tofree->physstart, tofree->size);
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LL_REMOVE(proc->vas, tofree);
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pmm_free((uintptr_t)tofree->physstart, tofree->size / HAL_PAGE_SIZE);
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dlfree(tofree);
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return E_OK;
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}
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