Thu, 02 Dec 2010 23:03:13 +0000
move memory access and mapping functions into memory.[ch]
This is to tidy up main.c...
| philpem@40 | 1 | #ifndef _MEMORY_H |
| philpem@40 | 2 | #define _MEMORY_H |
| philpem@40 | 3 | |
| philpem@40 | 4 | /*********************************** |
| philpem@40 | 5 | * Array read/write utility macros |
| philpem@40 | 6 | * "Don't Repeat Yourself" :) |
| philpem@40 | 7 | ***********************************/ |
| philpem@40 | 8 | |
| philpem@40 | 9 | /// Array read, 32-bit |
| philpem@40 | 10 | #define RD32(array, address, andmask) \ |
| philpem@40 | 11 | (((uint32_t)array[(address + 0) & (andmask)] << 24) | \ |
| philpem@40 | 12 | ((uint32_t)array[(address + 1) & (andmask)] << 16) | \ |
| philpem@40 | 13 | ((uint32_t)array[(address + 2) & (andmask)] << 8) | \ |
| philpem@40 | 14 | ((uint32_t)array[(address + 3) & (andmask)])) |
| philpem@40 | 15 | |
| philpem@40 | 16 | /// Array read, 16-bit |
| philpem@40 | 17 | #define RD16(array, address, andmask) \ |
| philpem@40 | 18 | (((uint32_t)array[(address + 0) & (andmask)] << 8) | \ |
| philpem@40 | 19 | ((uint32_t)array[(address + 1) & (andmask)])) |
| philpem@40 | 20 | |
| philpem@40 | 21 | /// Array read, 8-bit |
| philpem@40 | 22 | #define RD8(array, address, andmask) \ |
| philpem@40 | 23 | ((uint32_t)array[(address + 0) & (andmask)]) |
| philpem@40 | 24 | |
| philpem@40 | 25 | /// Array write, 32-bit |
| philpem@40 | 26 | #define WR32(array, address, andmask, value) { \ |
| philpem@40 | 27 | array[(address + 0) & (andmask)] = (value >> 24) & 0xff; \ |
| philpem@40 | 28 | array[(address + 1) & (andmask)] = (value >> 16) & 0xff; \ |
| philpem@40 | 29 | array[(address + 2) & (andmask)] = (value >> 8) & 0xff; \ |
| philpem@40 | 30 | array[(address + 3) & (andmask)] = value & 0xff; \ |
| philpem@40 | 31 | } |
| philpem@40 | 32 | |
| philpem@40 | 33 | /// Array write, 16-bit |
| philpem@40 | 34 | #define WR16(array, address, andmask, value) { \ |
| philpem@40 | 35 | array[(address + 0) & (andmask)] = (value >> 8) & 0xff; \ |
| philpem@40 | 36 | array[(address + 1) & (andmask)] = value & 0xff; \ |
| philpem@40 | 37 | } |
| philpem@40 | 38 | |
| philpem@40 | 39 | /// Array write, 8-bit |
| philpem@40 | 40 | #define WR8(array, address, andmask, value) \ |
| philpem@40 | 41 | array[(address + 0) & (andmask)] = value & 0xff; |
| philpem@40 | 42 | |
| philpem@40 | 43 | /****************** |
| philpem@40 | 44 | * Memory mapping |
| philpem@40 | 45 | ******************/ |
| philpem@40 | 46 | |
| philpem@40 | 47 | typedef enum { |
| philpem@40 | 48 | MEM_ALLOWED = 0, |
| philpem@40 | 49 | MEM_PAGEFAULT, // Page fault -- page not present |
| philpem@40 | 50 | MEM_PAGE_NO_WE, // Page not write enabled |
| philpem@40 | 51 | MEM_KERNEL, // User attempted to access kernel memory |
| philpem@40 | 52 | MEM_UIE // User Nonmemory Location Access |
| philpem@40 | 53 | } MEM_STATUS; |
| philpem@40 | 54 | |
| philpem@40 | 55 | /** |
| philpem@40 | 56 | * @brief Check memory access permissions for a given address. |
| philpem@40 | 57 | * @param addr Address. |
| philpem@40 | 58 | * @param writing true if writing to memory, false if reading. |
| philpem@40 | 59 | * @return One of the MEM_STATUS constants, specifying whether the access is |
| philpem@40 | 60 | * permitted, or what error occurred. |
| philpem@40 | 61 | */ |
| philpem@40 | 62 | MEM_STATUS checkMemoryAccess(uint32_t addr, bool writing); |
| philpem@40 | 63 | |
| philpem@40 | 64 | /** |
| philpem@40 | 65 | * @brief Map a CPU memory address into physical memory space. |
| philpem@40 | 66 | * @param addr Address. |
| philpem@40 | 67 | * @param writing true if writing to memory, false if reading. |
| philpem@40 | 68 | * @return Address, remapped into physical memory. |
| philpem@40 | 69 | */ |
| philpem@40 | 70 | uint32_t mapAddr(uint32_t addr, bool writing); |
| philpem@40 | 71 | |
| philpem@40 | 72 | #endif |