65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
#include <kernel/process.h>
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#include <kernel/unistd_32.h>
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#include <kernel/memory.h>
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#include <kernel/util.h>
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pid_t process_create(const char *name)
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{
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extern process_t *process_current;
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process_t *process;
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pid_t process_pid;
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// Check error
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if (name == NULL)
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return (-1);
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// Try to find free slot.
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process_pid = process_alloc(&process);
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if (process == NULL)
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return (-1);
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// Initialize stack
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process->context.reg[15] = (uint32_t)pm_alloc(PROCESS_STACK_SIZE);
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if (process->context.reg[15] == 0x00000000)
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{
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//TODO: errno
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//FIXME: free allocated process.
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return (-1);
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}
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// Set process name.
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strncpy(process->name, name, PROCESS_NAME_LENGHT);
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// Initialize context.
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for (int i = 0 ; i < 15 ; i = i + 1)
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process->context.reg[i] = 0x00000000;
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// Initialize "special" registers.
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process->context.gbr = 0x00000000;
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process->context.macl = 0x00000000;
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process->context.mach = 0x00000000;
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process->context.ssr = 0x00000000;
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process->context.spc = 0x00000000;
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// initialize "exit" part.
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uint8_t callexit[6] = {
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0b11000011, __NR_exit, // trapa #__NR_exit
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0b10110000, 0b00000100, // bsr PC + 2 - 4
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0b00000000, 0b00001001 // nop
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};
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process->context.pr = (uint32_t)pm_alloc(6);
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if (process->context.pr == 0x00000000)
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{
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//TODO: errno
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//FIXME: free allocated process.
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return (-1);
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}
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memcpy((void *)process->context.pr, callexit, 6);
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// Initialize processes.
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process->parent = process_current;
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process->child = NULL;
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process->next = NULL;
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return (process_pid);
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}
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