diff options
Diffstat (limited to 'src/kernel/task.c')
| -rw-r--r-- | src/kernel/task.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/kernel/task.c b/src/kernel/task.c index 2550e4b..dfe50a7 100644 --- a/src/kernel/task.c +++ b/src/kernel/task.c @@ -46,11 +46,30 @@ void task_svc(uint32_t *args) *((int *)args[4]) = task_waitpid(args[1], (int *)args[2], args[3]); break; + case 4: + *((void **)args[2]) = task_sbrk(args[1]); + break; default: break; } } +void *task_sbrk(uint32_t bytes) +{ + if (task_current->heap == 0) { + task_current->heap = malloc(1024 * 16); + return (uint8_t *)task_current->heap + (1024 * 16); + } + + if (bytes == 0) { + alloc_t *alloc = (alloc_t *)((uint8_t *)task_current->heap - + sizeof(alloc_t)); + return (uint8_t *)task_current->heap + alloc->size; + } + + return (void *)-1; +} + void task_hold(uint8_t hold) { if (hold != 0) @@ -124,6 +143,7 @@ void task_purge(void) // Since we're single core, no one else can claim this memory until // a task switch, after which we're done with this memory anyway. free(task_current->stack); + free(task_current->heap); free(task_current); YIELD; @@ -163,6 +183,7 @@ task_t *task_create(void (*code)(void), uint16_t stackSize) t->status.state = TASK_RUNNING; t->status.value = 0; + t->heap = 0; t->stack = (uint32_t *)malloc(stackSize); void *sp = (uint8_t *)t->stack + stackSize - 68; // excep. stack + regs t->sp = sp; |