diff options
Diffstat (limited to 'kernel/riscv')
| -rw-r--r-- | kernel/riscv/kernel.c | 45 | ||||
| -rw-r--r-- | kernel/riscv/start.S | 106 |
2 files changed, 151 insertions, 0 deletions
diff --git a/kernel/riscv/kernel.c b/kernel/riscv/kernel.c new file mode 100644 index 0000000..4e72e2a --- /dev/null +++ b/kernel/riscv/kernel.c @@ -0,0 +1,45 @@ +#include <sys/log.h> +#include <sys/mem.h> +#include <sys/cpio.h> +#include <early/bump.h> + +#define KERNEL_SIZE 3 * 1024 * 1024 + +uint32_t user_regs[31]; + +void kernel_main(size_t hart, void *fdt) { + printk("Doing kernel init with hard ID %d\n", hart); + + struct dt_node *head = dt_parse(fdt); + struct mem_info *info = km_find_memory(head); + + + if (!info) { + printk("failed to find memory info!\n"); + return; + } + + info->start = (void *)((uint8_t *)info->start + KERNEL_SIZE); + info->size -= KERNEL_SIZE; + + km_init(info); + + printk("memory blocks initialized\n"); + + size_t len = 0; + uint32_t *initrd = dt_get_prop(head, "initrd", &len); + if (!initrd || len < 8) { + printk("failed to find initrd!\n"); + return; + } + uint32_t base = btohi(initrd[0]); + uint32_t size = btohi(initrd[1]); + + char *file = cpio_get_file((void*)base, (size_t)size, "/sbin/init"); + (void)file; +} + +void kernel_trap() { + + +} diff --git a/kernel/riscv/start.S b/kernel/riscv/start.S new file mode 100644 index 0000000..ecec47b --- /dev/null +++ b/kernel/riscv/start.S @@ -0,0 +1,106 @@ +.section .text._start +.global _start +.type _start, @function +.type _syscall_start, @function +.type _syscall_exit, @function + +.extern user_regs + +_start: + csrw sstatus, zero + csrw sie, zero + + la t0, _syscall_start + csrw stvec, t0 + + la sp, __stack_top + + la t0, __bss_start + la t1, __bss_end + beq t0, t1, 2f +1: + sw zero, 0(t0) + addi t0, t0, 4 + bltu t0, t1, 1b +2: + call kernel_main + wfi + +_syscall_start: + csrw sscratch, x1 + la x1, user_regs + + sw x2, 4(x1) + sw x3, 8(x1) + sw x4, 12(x1) + sw x5, 16(x1) + sw x6, 20(x1) + sw x7, 24(x1) + sw x8, 28(x1) + sw x9, 32(x1) + sw x10, 36(x1) + sw x11, 40(x1) + sw x12, 44(x1) + sw x13, 48(x1) + sw x14, 52(x1) + sw x15, 56(x1) + sw x16, 60(x1) + sw x17, 64(x1) + sw x18, 68(x1) + sw x19, 72(x1) + sw x20, 76(x1) + sw x21, 80(x1) + sw x22, 84(x1) + sw x23, 88(x1) + sw x24, 92(x1) + sw x25, 96(x1) + sw x26, 100(x1) + sw x27, 104(x1) + sw x28, 108(x1) + sw x29, 112(x1) + sw x30, 116(x1) + sw x31, 120(x1) + + csrr t0, sscratch + sw t0, 0(x1) + + jal kernel_trap + +_syscall_exit: + csrw sscratch, x1 + la x1, user_regs + + lw x2, 4(x1) + lw x3, 8(x1) + lw x4, 12(x1) + lw x5, 16(x1) + lw x6, 20(x1) + lw x7, 24(x1) + lw x8, 28(x1) + lw x9, 32(x1) + lw x10, 36(x1) + lw x11, 40(x1) + lw x12, 44(x1) + lw x13, 48(x1) + lw x14, 52(x1) + lw x15, 56(x1) + lw x16, 60(x1) + lw x17, 64(x1) + lw x18, 68(x1) + lw x19, 72(x1) + lw x20, 76(x1) + lw x21, 80(x1) + lw x22, 84(x1) + lw x23, 88(x1) + lw x24, 92(x1) + lw x25, 96(x1) + lw x26, 100(x1) + lw x27, 104(x1) + lw x28, 108(x1) + lw x29, 112(x1) + lw x30, 116(x1) + lw x31, 120(x1) + + csrr x1, sscratch + + sret |