env_vars.c revision 161202
1161202Simp/****************************************************************************** 2161202Simp * 3161202Simp * Filename: env_vars.c 4161202Simp * 5161202Simp * Instantiation of environment variables, structures, and other globals. 6161202Simp * 7161202Simp * Revision information: 8161202Simp * 9161202Simp * 20AUG2004 kb_admin initial creation 10161202Simp * 11161202Simp * BEGIN_KBDD_BLOCK 12161202Simp * No warranty, expressed or implied, is included with this software. It is 13161202Simp * provided "AS IS" and no warranty of any kind including statutory or aspects 14161202Simp * relating to merchantability or fitness for any purpose is provided. All 15161202Simp * intellectual property rights of others is maintained with the respective 16161202Simp * owners. This software is not copyrighted and is intended for reference 17161202Simp * only. 18161202Simp * END_BLOCK 19161202Simp * 20161202Simp * $FreeBSD: head/sys/boot/arm/at91/bootiic/env_vars.c 161202 2006-08-10 19:55:52Z imp $ 21161202Simp *****************************************************************************/ 22161202Simp 23161202Simp#include "env_vars.h" 24161202Simp#include "loader_prompt.h" 25161202Simp#include "lib.h" 26161202Simp 27161202Simp/******************************* GLOBALS *************************************/ 28161202Simpchar boot_commands[MAX_BOOT_COMMANDS][MAX_INPUT_SIZE]; 29161202Simp 30161202Simpchar env_table[MAX_ENV_SIZE_BYTES]; 31161202Simp 32161202Simpextern char BootCommandSection; 33161202Simp 34161202Simp/************************** PRIVATE FUNCTIONS ********************************/ 35161202Simp 36161202Simp 37161202Simpstatic int currentIndex; 38161202Simpstatic int currentOffset; 39161202Simp 40161202Simp 41161202Simp/* 42161202Simp * .KB_C_FN_DEFINITION_START 43161202Simp * int ReadCharFromEnvironment(char *) 44161202Simp * This private function reads characters from the enviroment variables 45161202Simp * to service the command prompt during auto-boot or just to setup the 46161202Simp * default environment. Returns positive value if valid character was 47161202Simp * set in the pointer. Returns negative value to signal input stream 48161202Simp * terminated. Returns 0 to indicate _wait_ condition. 49161202Simp * .KB_C_FN_DEFINITION_END 50161202Simp */ 51161202Simpstatic int 52161202SimpReadCharFromEnvironment(int timeout) 53161202Simp{ 54161202Simp int ch; 55161202Simp 56161202Simp if (currentIndex < MAX_BOOT_COMMANDS) { 57161202Simp ch = boot_commands[currentIndex][currentOffset++]; 58161202Simp if (ch == '\0' || (currentOffset >= MAX_INPUT_SIZE)) { 59161202Simp currentOffset = 0; 60161202Simp ++currentIndex; 61161202Simp ch = '\r'; 62161202Simp } 63161202Simp return (ch); 64161202Simp } 65161202Simp 66161202Simp return (-1); 67161202Simp} 68161202Simp 69161202Simp 70161202Simp/*************************** GLOBAL FUNCTIONS ********************************/ 71161202Simp 72161202Simp 73161202Simp/* 74161202Simp * .KB_C_FN_DEFINITION_START 75161202Simp * void WriteCommandTable(void) 76161202Simp * This global function write the current command table to the non-volatile 77161202Simp * memory. 78161202Simp * .KB_C_FN_DEFINITION_END 79161202Simp */ 80161202Simpvoid 81161202SimpWriteCommandTable(void) 82161202Simp{ 83161202Simp int i, size = MAX_ENV_SIZE_BYTES, copySize; 84161202Simp char *cPtr = env_table; 85161202Simp 86161202Simp p_memset(env_table, 0, sizeof(env_table)); 87161202Simp 88161202Simp for (i = 0; i < MAX_BOOT_COMMANDS; ++i) { 89161202Simp 90161202Simp copySize = p_strlen(boot_commands[i]); 91161202Simp size -= copySize + 1; 92161202Simp 93161202Simp if (size < 0) { 94161202Simp continue; 95161202Simp } 96161202Simp p_memcpy(cPtr, boot_commands[i], copySize); 97161202Simp cPtr += copySize; 98161202Simp *cPtr++ = 0; 99161202Simp } 100161202Simp 101161202Simp /* We're executing in low RAM so addr in ram == offset in eeprom */ 102161202Simp WriteEEPROM((unsigned)&BootCommandSection, env_table, 103161202Simp sizeof(env_table)); 104161202Simp} 105161202Simp 106161202Simp 107161202Simp/* 108161202Simp * .KB_C_FN_DEFINITION_START 109161202Simp * void SetBootCommand(int index, char *command) 110161202Simp * This global function replaces the specified index with the string residing 111161202Simp * at command. Execute this function with a NULL string to clear the 112161202Simp * associated command index. 113161202Simp * .KB_C_FN_DEFINITION_END 114161202Simp */ 115161202Simpvoid 116161202SimpSetBootCommand(int index, char *command) 117161202Simp{ 118161202Simp int i; 119161202Simp 120161202Simp if ((unsigned)index < MAX_BOOT_COMMANDS) { 121161202Simp 122161202Simp p_memset(boot_commands[index], 0, MAX_INPUT_SIZE); 123161202Simp 124161202Simp if (!command) 125161202Simp return ; 126161202Simp 127161202Simp for (i = 0; i < MAX_INPUT_SIZE; ++i) { 128161202Simp boot_commands[index][i] = command[i]; 129161202Simp if (!(boot_commands[index][i])) 130161202Simp return; 131161202Simp } 132161202Simp } 133161202Simp} 134161202Simp 135161202Simp 136161202Simp/* 137161202Simp * .KB_C_FN_DEFINITION_START 138161202Simp * void DumpBootCommands(void) 139161202Simp * This global function displays the current boot commands. 140161202Simp * .KB_C_FN_DEFINITION_END 141161202Simp */ 142161202Simpvoid 143161202SimpDumpBootCommands(void) 144161202Simp{ 145161202Simp int i, j; 146161202Simp 147161202Simp for (i = 0; i < MAX_BOOT_COMMANDS; ++i) { 148161202Simp printf("0x%x : ", i); 149161202Simp for (j = 0; j < MAX_INPUT_SIZE; ++j) { 150161202Simp putchar(boot_commands[i][j]); 151161202Simp if (!(boot_commands[i][j])) 152161202Simp break; 153161202Simp } 154161202Simp printf("[E]\n\r"); 155161202Simp } 156161202Simp} 157161202Simp 158161202Simp 159161202Simp/* 160161202Simp * .KB_C_FN_DEFINITION_START 161161202Simp * void LoadBootCommands(void) 162161202Simp * This global function loads the existing boot commands from raw format and 163161202Simp * coverts it to the standard, command-index format. Notice, the processed 164161202Simp * boot command table has much more space allocated than the actual table 165161202Simp * stored in non-volatile memory. This is because the processed table 166161202Simp * exists in RAM which is larger than the non-volatile space. 167161202Simp * .KB_C_FN_DEFINITION_END 168161202Simp */ 169161202Simpvoid 170161202SimpLoadBootCommands(void) 171161202Simp{ 172161202Simp int index, j, size; 173161202Simp char *cPtr; 174161202Simp 175161202Simp p_memset((char*)boot_commands, 0, sizeof(boot_commands)); 176161202Simp 177161202Simp cPtr = &BootCommandSection; 178161202Simp 179161202Simp size = MAX_ENV_SIZE_BYTES; 180161202Simp 181161202Simp for (index = 0; (index < MAX_BOOT_COMMANDS) && size; ++index) { 182161202Simp for (j = 0; (j < MAX_INPUT_SIZE) && size; ++j) { 183161202Simp size--; 184161202Simp boot_commands[index][j] = *cPtr++; 185161202Simp if (!(boot_commands[index][j])) { 186161202Simp break; 187161202Simp } 188161202Simp } 189161202Simp } 190161202Simp} 191161202Simp 192161202Simp 193161202Simp/* 194161202Simp * .KB_C_FN_DEFINITION_START 195161202Simp * void ExecuteEnvironmentFunctions(void) 196161202Simp * This global function executes applicable entries in the environment. 197161202Simp * .KB_C_FN_DEFINITION_END 198161202Simp */ 199161202Simpvoid 200161202SimpExecuteEnvironmentFunctions(void) 201161202Simp{ 202161202Simp currentIndex = 0; 203161202Simp currentOffset = 0; 204161202Simp 205161202Simp DumpBootCommands(); 206161202Simp Bootloader(ReadCharFromEnvironment); 207161202Simp} 208