| 1,5 → 1,5 |
|---|
| /* |
| * Copyright (c) 2003-2004 Jakub Jermar |
| * Copyright (c) 2007 Pavel Jancik, Michal Kebrt |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| 30,22 → 30,80 |
|---|
| * @{ |
| */ |
| /** @file |
| * @brief Paging related functions. |
| */ |
| |
| #include <arch/mm/page.h> |
| #include <genarch/mm/page_pt.h> |
| #include <mm/page.h> |
| #include <align.h> |
| #include <config.h> |
| #include <arch/exception.h> |
| #include <typedefs.h> |
| #include <arch/types.h> |
| #include <interrupt.h> |
| #include <arch/mm/frame.h> |
| |
| /** Initializes page tables. |
| * |
| * 1:1 virtual-physical mapping is created in kernel address space. Mapping |
| * for table with exception vectors is also created. |
| */ |
| void page_arch_init(void) |
| { |
| uintptr_t cur; |
| int flags; |
| |
| page_mapping_operations = &pt_mapping_operations; |
| |
| flags = PAGE_CACHEABLE; |
| |
| /* PA2KA(identity) mapping for all frames until last_frame */ |
| for (cur = 0; cur < last_frame; cur += FRAME_SIZE) { |
| page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags); |
| } |
| |
| /* create mapping for exception table at high offset */ |
| #ifdef HIGH_EXCEPTION_VECTORS |
| void *virtaddr = frame_alloc(ONE_FRAME, FRAME_KA); |
| page_mapping_insert(AS_KERNEL, EXC_BASE_ADDRESS, KA2PA(virtaddr), flags); |
| #else |
| #error "Only high exception vector supported now" |
| #endif |
| |
| as_switch(NULL, AS_KERNEL); |
| |
| boot_page_table_free(); |
| } |
| |
| /** Map device into kernel space. */ |
| /** Maps device into the kernel space. |
| * |
| * Maps physical address of device into kernel virtual address space (so it can |
| * be accessed only by kernel through virtual address). |
| * |
| * @param physaddr Physical address where device is connected. |
| * @param size Length of area where device is present. |
| * |
| * @return Virtual address where device will be accessible. |
| */ |
| uintptr_t hw_map(uintptr_t physaddr, size_t size) |
| { |
| /* TODO */ |
| return NULL; |
| if (last_frame + ALIGN_UP(size, PAGE_SIZE) > |
| KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH)) { |
| panic("Unable to map physical memory %p (%d bytes)", |
| physaddr, size) |
| } |
| |
| uintptr_t virtaddr = PA2KA(last_frame); |
| pfn_t i; |
| for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++) { |
| page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), |
| physaddr + PFN2ADDR(i), |
| PAGE_NOT_CACHEABLE | PAGE_READ | PAGE_WRITE | PAGE_KERNEL); |
| } |
| |
| last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE); |
| return virtaddr; |
| } |
| |
| /** @} |