diff options
Diffstat (limited to 'arch/riscv/kernel/vmem.c')
| -rw-r--r-- | arch/riscv/kernel/vmem.c | 182 |
1 files changed, 0 insertions, 182 deletions
diff --git a/arch/riscv/kernel/vmem.c b/arch/riscv/kernel/vmem.c deleted file mode 100644 index 1f1f44a..0000000 --- a/arch/riscv/kernel/vmem.c +++ /dev/null @@ -1,182 +0,0 @@ -#include <apos/string.h> -#include <apos/pmem.h> -#include <apos/vmem.h> -#include <apos/mem.h> -#include <apos/debug.h> -#include <apos/cpu.h> -#include <pages.h> -#include <vmem.h> -#include <csr.h> - -#define pte_ppn(pte) (((pm_t)(pte)) >> 10) -#define pte_flags(pte) (((pm_t)(pte)) & 0xff) -#define to_pte(p, f) ((pm_to_pnum(p) << 10) | (f)) -#define pte_addr(pte) __va(pnum_to_paddr(pte_ppn(pte))) -#define pte_paddr(pte) (pnum_to_paddr(pte_ppn(pte))) -#define vm_to_index(a, o) (pm_to_index(a, o)) -#define is_active(pte) (pte_flags(pte) & VM_V) -#define is_leaf(pte) (is_active(pte) && (pte_flags(pte) & ~VM_V)) -#define is_branch(pte) (is_active(pte) && !(pte_flags(pte) & ~VM_V)) - -static pm_t *__find_vmem(struct vm_branch *b, vm_t v, enum mm_order *o) -{ - enum mm_order top = __mm_max_order; - if(o) - *o = MM_O0; - do { - size_t idx = vm_to_index(v, top); - pm_t pte = (pm_t)b->leaf[idx]; - - if(!pte) - return 0; - - if(is_leaf(pte)){ - if(o) - *o = top; - - return (pm_t *)&b->leaf[idx]; - } - - b = (struct vm_branch *)pte_addr(pte); - } while (top--); - - return 0; -} - -int mod_vmem(struct vm_branch *branch, vm_t vaddr, pm_t paddr, uint8_t flags) -{ - pm_t *pte = __find_vmem(branch, vaddr, 0); - if(pte){ - *pte = to_pte((pm_t)__pa(paddr), flags); - return 0; - } - - return -1; -} - -/* huh, should probably add status flags etc. to all my API functions. Damn, I'm - * lazy. */ -int stat_vmem(struct vm_branch *branch, vm_t vaddr, pm_t *paddr, - enum mm_order *order, uint8_t *flags) -{ - pm_t *pte = __find_vmem(branch, vaddr, order); - if(pte){ - if(paddr) - *paddr = (pm_t)pte_addr(*pte); - - if(flags) - *flags = pte_flags(*pte); - - return 0; - } - - return -1; -} - -static struct vm_branch *__create_leaf() -{ - pm_t new_leaf = alloc_page(MM_KPAGE, 0); - memset((void *)new_leaf, 0, sizeof(struct vm_branch)); - return (struct vm_branch *)to_pte((pm_t)__pa(new_leaf), VM_V); -} - -static void __destroy_branch(struct vm_branch *b) -{ - if(!b) - return; - - for(size_t i = 0; i < BASE_PAGE_SIZE / sizeof(pm_t); ++i){ - if(is_branch(b->leaf[i])) - __destroy_branch((struct vm_branch *)pte_addr(b->leaf[i])); - - free_page(MM_KPAGE, (pm_t)pte_addr(b->leaf[i])); - } -} - -void map_vmem(struct vm_branch *branch, - pm_t paddr, vm_t vaddr, uint8_t flags, enum mm_order order) -{ - enum mm_order top = __mm_max_order; - while (top != order) { - size_t idx = vm_to_index(vaddr, top); - - if (!branch->leaf[idx]) - branch->leaf[idx] = __create_leaf(); - - - branch = (struct vm_branch *)pte_addr(branch->leaf[idx]); - top--; - } - - size_t idx = vm_to_index(vaddr, top); - if (is_branch(branch->leaf[idx])) /* something has gone terribly wrong */ - __destroy_branch(branch->leaf[idx]); - - branch->leaf[idx] = (struct vm_branch *)to_pte((pm_t)__pa(paddr), flags); -} - -void unmap_vmem(struct vm_branch *branch, vm_t vaddr) -{ - - pm_t *pte = __find_vmem(branch, vaddr, 0); - if(pte) - *pte = 0; -} - -void flush_tlb() -{ - __asm__("sfence.vma %0\n" :: "rk" (cpu_id()) : "memory"); -} - -void flush_tlb_all() -{ - __asm__("sfence.vma\n" ::: "memory"); -} - -static void start_vmem(struct vm_branch *branch, enum mm_mode m) -{ - branch = (struct vm_branch *)__pa(branch); - - if(m == Sv32) - csr_write(CSR_SATP, SATP_MODE_Sv32 | pm_to_pnum((pm_t)(branch))); - else if (m == Sv39) - csr_write(CSR_SATP, SATP_MODE_Sv39 | pm_to_pnum((pm_t)(branch))); - else - csr_write(CSR_SATP, SATP_MODE_Sv48 | pm_to_pnum((pm_t)(branch))); - - flush_tlb_all(); - /* Sv57 && Sv64 in the future? */ -} - -struct vm_branch *init_vmem(void *fdt) -{ - UNUSED(fdt); - struct vm_branch *b = (struct vm_branch *)alloc_page(MM_KPAGE, 0); - memset(b, 0, MM_KPAGE_SIZE); - - populate_root_branch(b); - /* update which memory branch to use */ - start_vmem(b, Sv39); - return b; -} - -void populate_root_branch(struct vm_branch *b) -{ - size_t flags = VM_V | VM_R | VM_W | VM_X | VM_G; - for(size_t i = KSTART_PAGE; i < IO_PAGE; ++i) - b->leaf[i] = (struct vm_branch *)to_pte(RAM_BASE + SZ_1G * (i - KSTART_PAGE), flags); - - /* map kernel IO to zero for now, this will be overridden later - * (if at all) */ - b->leaf[IO_PAGE] = (struct vm_branch *)to_pte(0, flags); -} - -#ifdef DEBUG -int setup_kernel_io(struct vm_branch *b, vm_t paddr) -{ - /* assume Sv39 for now */ - pm_t gigapage = paddr / MM_GPAGE_SIZE; - b->leaf[IO_PAGE] = (struct vm_branch *)to_pte(gigapage, VM_V | VM_R | VM_W); - return -SZ_1G + paddr - (gigapage * MM_GPAGE_SIZE); -} -#endif |