kamkow1
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56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
#include <aux/elf.h>
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#include <libk/std.h>
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#include <libk/string.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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struct proc* proc_from_elf (uint8_t* elf_contents) {
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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.syscall_stack = pmm_alloc (KSTACK_SIZE / PAGE_SIZE);
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if (proc->pdata.syscall_stack == PMM_ALLOC_ERR) {
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free (proc);
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return NULL;
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}
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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 (proc->pdata.syscall_stack, USTACK_SIZE / PAGE_SIZE);
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return NULL;
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}
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uintptr_t user_stack = proc->pdata.user_stack;
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proc->pdata.syscall_stack += KSTACK_SIZE;
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proc->pdata.user_stack += USTACK_SIZE;
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proc_map (proc, 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 = 0x20 | 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 = 0x18 | 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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return proc;
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}
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