diff options
Diffstat (limited to 'arch/riscv/init')
| -rw-r--r-- | arch/riscv/init/init.c | 80 |
1 files changed, 65 insertions, 15 deletions
diff --git a/arch/riscv/init/init.c b/arch/riscv/init/init.c index 48fa661..9b7d371 100644 --- a/arch/riscv/init/init.c +++ b/arch/riscv/init/init.c @@ -17,6 +17,12 @@ struct pm_layout_t { pm_t top; }; +struct pm_orders_t { + size_t max_order; + size_t bits[10]; + size_t page_shift; +}; + static struct pm_layout_t get_memlayout(void *fdt) { struct cell_info_t ci = get_reginfo(fdt, "/memory"); @@ -125,16 +131,16 @@ static void mark_reserved_mem(void *fdt) mark_area_used(base, top); } -static void init_pmem(void *fdt) +static struct pm_orders_t init_pmem(void *fdt) { enum mm_mode_t mmode = get_mmode(fdt); size_t max_order = 0; - size_t order_width = 9; + size_t order_bits = 9; switch(mmode){ case Sv32: max_order = 1; - order_width = 10; + order_bits = 10; break; case Sv39: @@ -146,17 +152,21 @@ static void init_pmem(void *fdt) break; }; - size_t widths[10] = {0}; + size_t bits[10] = {0}; for(size_t i = 0; i <= max_order; ++i) - widths[i] = order_width; + bits[i] = order_bits; + + init_mem(max_order, bits, 12); - init_mem(max_order, widths, 12); + struct pm_orders_t ret = {max_order, {0}, 12}; + for(size_t i = 0; i <= __mm_max_order; ++i) + ret.bits[i] = bits[i]; + + return ret; } -static void setup_pmem(void *fdt) +static struct pm_layout_t setup_pmem(void *fdt) { - init_pmem(fdt); - struct pm_layout_t pmem = get_memlayout(fdt); pm_t initrd_top = get_initrdtop(fdt); @@ -199,6 +209,8 @@ static void setup_pmem(void *fdt) /* mark reserved mem */ mark_reserved_mem(fdt); + + return (struct pm_layout_t){.base = pmap_base, .top = actual_size + pmap_base}; } pm_t move_kernel() @@ -229,10 +241,27 @@ struct vm_branch_t *prepare_vmem() /* map stack */ map_vmem(branch, PM_STACK_BASE, PM_STACK_BASE, VM_R | VM_W | VM_V, MM_MPAGE); + /* map root pte */ + map_vmem(branch, (pm_t)branch, ROOT_PTE, VM_R | VM_W | VM_V, MM_KPAGE); + + map_vmem(branch, 0x10000000, 0x10000000, VM_R | VM_W | VM_V, MM_KPAGE); + /* TODO: map more stuff? */ return branch; } +static vm_t prepare_tmp_pte(struct vm_branch_t *branch) +{ + /* make sure the TMP_PTE is mapped to *something* */ + map_vmem(branch, 0, TMP_PTE, VM_R | VM_W | VM_V, MM_KPAGE); + + struct vm_branch_t *tmp_pte = arch_get_tmp_pte(branch); + + vm_t addr = TMP_PTE + MM_KPAGE_SIZE; + map_vmem(branch, (vm_t)tmp_pte, addr, VM_R | VM_W | VM_V, MM_KPAGE); + return addr; +} + void start_vmem(void *fdt, struct vm_branch_t *branch) { /* TODO: get ASID from CPU id */ @@ -250,7 +279,10 @@ void start_vmem(void *fdt, struct vm_branch_t *branch) /* Sv57 && Sv64 in the future? */ } -struct init_data_t populate_initdata(void *fdt, struct vm_branch_t *branch) +struct init_data_t populate_initdata(void *fdt, struct pm_orders_t o, + struct pm_layout_t p, + struct vm_branch_t *b, + vm_t v) { extern char __init_start, __init_end; @@ -261,13 +293,29 @@ struct init_data_t populate_initdata(void *fdt, struct vm_branch_t *branch) d.initrd_base = get_initrdbase(fdt); d.initrd_top = get_initrdtop(fdt); + d.pmap_base = p.base; + d.pmap_top = p.top; + d.fdt_base = get_fdtbase(fdt); d.fdt_top = get_fdttop(fdt); d.stack_base = PM_STACK_BASE; d.stack_top = PM_STACK_TOP; - d.kernel_vm_base = branch; + d.kernel_vm_base = b; + d.tmp_pte = v; + + d.max_order = o.max_order; + for(size_t i = 0; i <= __mm_max_order; ++i) + d.bits[i] = o.bits[i]; + d.page_shift = o.page_shift; + + /* initialize pmap in vmem */ + pm_t addr = p.base; + while(addr < p.top){ + map_vmem(b, addr, addr, VM_R | VM_W | VM_V, MM_MPAGE); + addr += MM_MPAGE_SIZE; + } return d; } @@ -276,11 +324,13 @@ void init(void *fdt) { init_debug(fdt); dbg_fdt(fdt); - setup_pmem(fdt); - struct vm_branch_t *branch = prepare_vmem(); - struct init_data_t d = populate_initdata(fdt, branch); - start_vmem(fdt, branch); + struct pm_orders_t o = init_pmem(fdt); + struct pm_layout_t p = setup_pmem(fdt); + struct vm_branch_t *b = prepare_vmem(); + vm_t v = prepare_tmp_pte(b); + struct init_data_t d = populate_initdata(fdt, o, p, b, v); + start_vmem(fdt, b); /* update_pmap(TODO: figure out where to place pmap in vmem); */ void (*main)(struct init_data_t) = (void (*)(struct init_data_t))VM_KERN; |