| #include "cpu.h" |
| |
| #include "arch_cpu.h" |
| #include "dlog.h" |
| #include "std.h" |
| #include "vm.h" |
| |
| /* The stack to be used by the CPUs. */ |
| alignas(2 * sizeof(size_t)) static char callstacks[STACK_SIZE * MAX_CPUS]; |
| |
| /* State of all supported CPUs. The stack of the first one is initialized. */ |
| struct cpu cpus[MAX_CPUS] = { |
| { |
| .is_on = 1, |
| .stack_bottom = callstacks + STACK_SIZE, |
| }, |
| }; |
| |
| void cpu_module_init(void) |
| { |
| size_t i; |
| |
| /* Initialize all CPUs. */ |
| for (i = 0; i < MAX_CPUS; i++) { |
| struct cpu *c = cpus + i; |
| cpu_init(c); |
| c->id = i; /* TODO: Initialize ID. */ |
| c->stack_bottom = callstacks + STACK_SIZE * (i + 1); |
| } |
| } |
| |
| size_t cpu_index(struct cpu *c) |
| { |
| return cpus - c; |
| } |
| |
| void cpu_init(struct cpu *c) |
| { |
| /* TODO: Assumes that c is zeroed out already. */ |
| sl_init(&c->lock); |
| c->irq_disable_count = 1; |
| } |
| |
| void cpu_irq_enable(struct cpu *c) |
| { |
| c->irq_disable_count--; |
| if (!c->irq_disable_count) { |
| arch_irq_enable(); |
| } |
| } |
| |
| void cpu_irq_disable(struct cpu *c) |
| { |
| if (!c->irq_disable_count) { |
| arch_irq_disable(); |
| } |
| c->irq_disable_count++; |
| } |
| |
| /** |
| * Turns CPU on and returns the previous state. |
| */ |
| bool cpu_on(struct cpu *c) |
| { |
| bool prev; |
| |
| sl_lock(&c->lock); |
| prev = c->is_on; |
| c->is_on = true; |
| sl_unlock(&c->lock); |
| |
| if (!prev) { |
| /* The CPU is currently off, we need to turn it on. */ |
| arch_cpu_on(c->id, c); |
| } |
| |
| return prev; |
| } |
| |
| /* |
| * This must be called only from the same CPU. |
| */ |
| void cpu_off(struct cpu *c) |
| { |
| sl_lock(&c->lock); |
| c->is_on = false; |
| sl_unlock(&c->lock); |
| |
| arch_cpu_off(); |
| } |
| |
| void vcpu_init(struct vcpu *vcpu, struct vm *vm) |
| { |
| memset(vcpu, 0, sizeof(*vcpu)); |
| sl_init(&vcpu->lock); |
| vcpu->vm = vm; |
| /* TODO: Initialize vmid register. */ |
| } |
| |
| void vcpu_on(struct vcpu *vcpu) |
| { |
| sl_lock(&vcpu->lock); |
| vcpu->is_on = true; |
| sl_unlock(&vcpu->lock); |
| } |
| |
| void vcpu_off(struct vcpu *vcpu) |
| { |
| sl_lock(&vcpu->lock); |
| vcpu->is_on = false; |
| sl_unlock(&vcpu->lock); |
| } |