diff options
Diffstat (limited to 'src/core/scheduler.c')
| -rw-r--r-- | src/core/scheduler.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/core/scheduler.c b/src/core/scheduler.c index 0f2b724..7b1c421 100644 --- a/src/core/scheduler.c +++ b/src/core/scheduler.c @@ -1,4 +1,7 @@ #include "libc/stdio.h" +#include "gdt.h" +#include "mem.h" +#include "paging.h" char show_tics=0; @@ -17,4 +20,45 @@ void clock(){ putchar('.'); } schedule(); +} + +void run_task(int *page_dir, void *task, int task_size){ + // Compute various addresses + int*pt_addr=PADDR(page_dir[1]); + void *entry_point=(void*)(PADDR(pt_addr[3])); + void *ustack=(void*)((int)entry_point+0xFF); + + // Load the task into memory + memcpy(task,entry_point, task_size); + + // Load page directory + asm( + "mov %0, %%eax \n\t" + "mov %%eax,%%cr3 \n\t" + :: "b"(page_dir) + ); + + // Setup users adresses + + // Switch to user task + asm ( + "cli \n\t" // Ensure we do not get interrupted + "movl %%ss, %%eax \n\t" + "movl %%eax, %0 \n\t" // Save kernel ss segment into the TSS + "movl %%esp, %1 \n\t" // Save kernel esp into the TSS BEFORE setting up the stack + "pushl $0x33 \n\t" // Push task ss which is 0x30 along with prlv which is 0x3 + "pushl %2 \n\t" // Push task esp + "pushfl \n\t" // Retrieve flags + "popl %%eax \n\t" + "orl $0x200, %%eax \n\t" // Enable interrupt for the user task + "and $0xffffbfff, %%eax \n\t" // Clear the NT flags + "push %%eax \n\t" // Push task flags + "push $0x23 \n\t" // Push task cs which is 0x20 along with prlv which is 0x3 + "push %3 \n\t" // Push task entry point + "mov $0x2B, %%eax \n\t" // GDT entry 0x28 along with prlv which is 0x3 + "mov %%eax, %%ds \n\t" // Setting up user data segment + "iret \n\t" // Launch user task + : "=m" (TSS.ss0), "=m" (TSS.esp0) + : "b" (ustack), "c" (entry_point) + ); }
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