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88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
#include <amd64/gdt.h>
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#include <aux/elf.h>
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#include <libk/list.h>
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#include <libk/std.h>
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#include <libk/string.h>
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#include <limine/requests.h>
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#include <mm/liballoc.h>
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#include <mm/pmm.h>
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#include <proc/proc.h>
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#include <sync/spin_lock.h>
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#include <sys/debug.h>
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static atomic_int pids = 1;
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struct proc* proc_from_elf (uint8_t* elf_contents) {
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struct limine_hhdm_response* hhdm = limine_hhdm_request.response;
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struct proc* proc = malloc (sizeof (*proc));
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if (proc == NULL)
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return NULL;
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memset (proc, 0, sizeof (*proc));
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proc->pd.lock = SPIN_LOCK_INIT;
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proc->pd.cr3_paddr = mm_alloc_user_pd_phys ();
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if (proc->pd.cr3_paddr == 0) {
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free (proc);
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return NULL;
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}
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proc->pdata.kernel_stack = pmm_alloc (KSTACK_SIZE / PAGE_SIZE);
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if (proc->pdata.kernel_stack == PMM_ALLOC_ERR) {
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free (proc);
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return NULL;
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}
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uintptr_t kernel_stack = proc->pdata.kernel_stack;
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proc->pdata.kernel_stack += (uintptr_t)hhdm->offset + KSTACK_SIZE;
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proc->pdata.user_stack = pmm_alloc (USTACK_SIZE / PAGE_SIZE);
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if (proc->pdata.user_stack == PMM_ALLOC_ERR) {
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free (proc);
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pmm_free (kernel_stack, USTACK_SIZE / PAGE_SIZE);
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return NULL;
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}
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proc_map (proc, proc->pdata.user_stack, PROC_USTACK_TOP - USTACK_SIZE, USTACK_SIZE / PAGE_SIZE,
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MM_PG_USER | MM_PG_PRESENT | MM_PG_RW);
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struct elf_aux aux = proc_load_segments (proc, elf_contents);
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proc->pdata.regs.ss = GDT_UDATA | 0x03;
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proc->pdata.regs.rsp = (uint64_t)PROC_USTACK_TOP;
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proc->pdata.regs.rflags = 0x202;
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proc->pdata.regs.cs = GDT_UCODE | 0x03;
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proc->pdata.regs.rip = aux.entry;
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proc->lock = SPIN_LOCK_INIT;
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atomic_store (&proc->state, PROC_READY);
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proc->pid = atomic_fetch_add (&pids, 1);
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return proc;
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}
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void proc_cleanup (struct proc* proc) {
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struct limine_hhdm_response* hhdm = limine_hhdm_request.response;
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struct list_node_link *mapping_link, *mapping_link_tmp;
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spin_lock (&proc->pd.lock);
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list_foreach (proc->mappings, mapping_link, mapping_link_tmp) {
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struct proc_mapping* mapping =
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list_entry (mapping_link, struct proc_mapping, proc_mappings_link);
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pmm_free (mapping->paddr, mapping->size / PAGE_SIZE);
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list_remove (proc->mappings, mapping_link);
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free (mapping);
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}
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spin_unlock (&proc->pd.lock);
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pmm_free (proc->pd.cr3_paddr, 1);
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pmm_free (proc->pdata.kernel_stack - (uintptr_t)hhdm->offset - KSTACK_SIZE,
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KSTACK_SIZE / PAGE_SIZE);
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pmm_free (proc->pdata.user_stack, USTACK_SIZE / PAGE_SIZE);
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free (proc);
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}
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