diff options
Diffstat (limited to 'arch/riscv64/kernel/vmem.c')
| -rw-r--r-- | arch/riscv64/kernel/vmem.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/arch/riscv64/kernel/vmem.c b/arch/riscv64/kernel/vmem.c index 0aa35cc..cb1eba0 100644 --- a/arch/riscv64/kernel/vmem.c +++ b/arch/riscv64/kernel/vmem.c @@ -420,11 +420,15 @@ __aligned(4096) struct vmem bootvmem; * it. */ __aligned(4096) struct vmem kvmem; +/* adding a third page entry would let us map the kernel at any 4KiB boundary + * but eh, Linux seems fine with 2MiB so I guess I shall be as well. */ + struct vmem *init_mapping() { rpc_pages = order_size(MM_O1) / BASE_PAGE_SIZE; kvmem.leaf[0] = (struct vmem *)to_pte(get_load_addr(), - VM_A | VM_G | VM_D | VM_R | VM_W | VM_X | VM_V); + VM_A | VM_G | VM_D | VM_R | VM_W | + VM_X | VM_V); __populate_dmap(&bootvmem); populate_kvmem(&bootvmem); @@ -462,6 +466,13 @@ void destroy_vmem(struct vmem *b) __destroy_branch(b); } +/** + * Helper for mapping in the kernel virtual page. + * Remember that the kernel lives on its own in a 2MiB (riscv64) region at + * VM_KERNEL, and \ref __va() and \ref __pa() won't directly work on it. + * + * @param b Branch to map kernel into. + */ static void map_kernel(struct vmem *b) { /* slightly worried about this not being guaranteed to be pc relative, |