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