Mon, 06 Dec 2010 01:43:04 +0000
fix side-select bug in WDC FDC driver, was causing all reads to occur on side0... now the Loader boots!
Loader will boot, but immediately gives up on the floppy drive... Not sure why.
| 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 |