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| 1 | /* | |
| 2 | * Milkymist SoC (Software) | |
| 3 | * Copyright (C) 2012 Yann Sionneau <yann.sionneau@gmail.com> | |
| 4 | * | |
| 5 | * This program is free software: you can redistribute it and/or modify | |
| 6 | * it under the terms of the GNU General Public License as published by | |
| 7 | * the Free Software Foundation, version 3 of the License. | |
| 8 | * | |
| 9 | * This program is distributed in the hope that it will be useful, | |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 | * GNU General Public License for more details. | |
| 13 | * | |
| 14 | * You should have received a copy of the GNU General Public License | |
| 15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 16 | */ | |
| 17 | ||
| 18 | #include <hal/mmu.h> | |
| 19 | #include <base/mmu.h> | |
| 20 | #include <base/stdio.h> | |
| 21 | ||
| 22 | #ifdef __ASSEMBLER__ | |
| 23 | #define MMPTR(x) x | |
| 24 | #else | |
| 25 | #define MMPTR(x) (*((volatile unsigned int *)(x))) | |
| 26 | #endif | |
| 27 | #define CSR_UART_RXTX MMPTR(0xe0000000) | |
| 28 | ||
| 29 | void f(void) {
| |
| 30 | char c = '@'; | |
| 31 | CSR_UART_RXTX = c; | |
| 32 | // asm volatile("bi f" ::: ); // We intinitely loop to f()
| |
| 33 | asm volatile("xor r0, r0, r0\n\t"
| |
| 34 | "xor r0, r0, r0" ::: ); | |
| 35 | } | |
| 36 | ||
| 37 | void itlbtest(void) {
| |
| 38 | register unsigned int stack, f_addr; | |
| 39 | unsigned int *p; | |
| 40 | unsigned int *pdest; | |
| 41 | unsigned int addr; | |
| 42 | ||
| 43 | asm volatile("mv %0, sp" : "=r"(stack) :: );
| |
| 44 | printf("stack == 0x%08X\n", stack);
| |
| 45 | ||
| 46 | printf("f() is located at 0x%p\n", f);
| |
| 47 | ||
| 48 | f_addr = 0x44004000; | |
| 49 | printf("Mapping f() into virtual memory at 0x%08X [physical == 0x%08X]\n", f_addr, f_addr+0x1000);
| |
| 50 | ||
| 51 | // for (addr = 0x00860000 ; addr <= 0x00874000 ; addr += 0x1000) | |
| 52 | // mmu_map(addr, addr, DTLB_MAPPING | MAPPING_CAN_READ); | |
| 53 | ||
| 54 | mmu_map(stack, stack, DTLB_MAPPING | MAPPING_CAN_READ | MAPPING_CAN_WRITE); | |
| 55 | mmu_map(f_addr, f_addr + 0x1000, ITLB_MAPPING | MAPPING_CAN_READ); | |
| 56 | mmu_map(itlbtest, itlbtest, ITLB_MAPPING | MAPPING_CAN_READ); | |
| 57 | mmu_map(call_function_with_itlb_enabled, call_function_with_itlb_enabled, ITLB_MAPPING | MAPPING_CAN_READ); | |
| 58 | puts("Mapping DONE");
| |
| 59 | ||
| 60 | // mmu_itlb_invalidate_line(f_addr); | |
| 61 | ||
| 62 | // We copy f's code to 0x44005000 | |
| 63 | for (p = f, pdest = 0x44005000 ; p < f + 0x1000 ; p++, pdest++) | |
| 64 | *pdest = *p; | |
| 65 | puts("Copy DONE");
| |
| 66 | ||
| 67 | asm volatile("wcsr DCC, r0\n\t"
| |
| 68 | "xor r0, r0, r0\n\t" | |
| 69 | "xor r0, r0, r0\n\t" | |
| 70 | "xor r0, r0, r0\n\t" | |
| 71 | "xor r0, r0, r0"); | |
| 72 | asm volatile("wcsr ICC, r0\n\t"
| |
| 73 | "xor r0, r0, r0"); | |
| 74 | puts("Instruction and Data caches have been invalidated");
| |
| 75 | ||
| 76 | call_function_with_itlb_enabled(f_addr); | |
| 77 | disable_dtlb(); | |
| 78 | disable_itlb(); | |
| 79 | puts("Call DONE");
| |
| 80 | - | } |
| 80 | + | |
| 81 | ||
| 82 | 00865a44 <f>: | |
| 83 | 865a44: 34 02 00 40 mvi r2,64 | |
| 84 | 865a48: 78 01 e0 00 mvhi r1,0xe000 | |
| 85 | 865a4c: 58 22 00 00 sw (r1+0),r2 | |
| 86 | 865a50: 98 00 00 00 xor r0,r0,r0 | |
| 87 | 865a54: 98 00 00 00 xor r0,r0,r0 | |
| 88 | 865a58: c3 a0 00 00 ret |
