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/******************************************************************************
*
* Filename: env_vars.c
*
* Instantiation of environment variables, structures, and other globals.
*
* Revision information:
*
* 20AUG2004 kb_admin initial creation
*
* BEGIN_KBDD_BLOCK
* No warranty, expressed or implied, is included with this software. It is
* provided "AS IS" and no warranty of any kind including statutory or aspects
* relating to merchantability or fitness for any purpose is provided. All
* intellectual property rights of others is maintained with the respective
* owners. This software is not copyrighted and is intended for reference
* only.
* END_BLOCK
*
* $FreeBSD$
*****************************************************************************/
#include "env_vars.h"
#include "loader_prompt.h"
#include "lib.h"
/******************************* GLOBALS *************************************/
char boot_commands[MAX_BOOT_COMMANDS][MAX_INPUT_SIZE];
char env_table[MAX_ENV_SIZE_BYTES];
extern char BootCommandSection;
/************************** PRIVATE FUNCTIONS ********************************/
static int currentIndex;
static int currentOffset;
/*
* .KB_C_FN_DEFINITION_START
* int ReadCharFromEnvironment(char *)
* This private function reads characters from the enviroment variables
* to service the command prompt during auto-boot or just to setup the
* default environment. Returns positive value if valid character was
* set in the pointer. Returns negative value to signal input stream
* terminated. Returns 0 to indicate _wait_ condition.
* .KB_C_FN_DEFINITION_END
*/
static int
ReadCharFromEnvironment(int timeout)
{
int ch;
if (currentIndex < MAX_BOOT_COMMANDS) {
ch = boot_commands[currentIndex][currentOffset++];
if (ch == '\0' || (currentOffset >= MAX_INPUT_SIZE)) {
currentOffset = 0;
++currentIndex;
ch = '\r';
}
return (ch);
}
return (-1);
}
/*************************** GLOBAL FUNCTIONS ********************************/
/*
* .KB_C_FN_DEFINITION_START
* void WriteCommandTable(void)
* This global function write the current command table to the non-volatile
* memory.
* .KB_C_FN_DEFINITION_END
*/
void
WriteCommandTable(void)
{
int i, size = MAX_ENV_SIZE_BYTES, copySize;
char *cPtr = env_table;
p_memset(env_table, 0, sizeof(env_table));
for (i = 0; i < MAX_BOOT_COMMANDS; ++i) {
copySize = p_strlen(boot_commands[i]);
size -= copySize + 1;
if (size < 0) {
continue;
}
p_memcpy(cPtr, boot_commands[i], copySize);
cPtr += copySize;
*cPtr++ = 0;
}
/* We're executing in low RAM so addr in ram == offset in eeprom */
WriteEEPROM((unsigned)&BootCommandSection, env_table,
sizeof(env_table));
}
/*
* .KB_C_FN_DEFINITION_START
* void SetBootCommand(int index, char *command)
* This global function replaces the specified index with the string residing
* at command. Execute this function with a NULL string to clear the
* associated command index.
* .KB_C_FN_DEFINITION_END
*/
void
SetBootCommand(int index, char *command)
{
int i;
if ((unsigned)index < MAX_BOOT_COMMANDS) {
p_memset(boot_commands[index], 0, MAX_INPUT_SIZE);
if (!command)
return ;
for (i = 0; i < MAX_INPUT_SIZE; ++i) {
boot_commands[index][i] = command[i];
if (!(boot_commands[index][i]))
return;
}
}
}
/*
* .KB_C_FN_DEFINITION_START
* void DumpBootCommands(void)
* This global function displays the current boot commands.
* .KB_C_FN_DEFINITION_END
*/
void
DumpBootCommands(void)
{
int i, j;
for (i = 0; i < MAX_BOOT_COMMANDS; ++i) {
printf("0x%x : ", i);
for (j = 0; j < MAX_INPUT_SIZE; ++j) {
putchar(boot_commands[i][j]);
if (!(boot_commands[i][j]))
break;
}
printf("[E]\n\r");
}
}
/*
* .KB_C_FN_DEFINITION_START
* void LoadBootCommands(void)
* This global function loads the existing boot commands from raw format and
* coverts it to the standard, command-index format. Notice, the processed
* boot command table has much more space allocated than the actual table
* stored in non-volatile memory. This is because the processed table
* exists in RAM which is larger than the non-volatile space.
* .KB_C_FN_DEFINITION_END
*/
void
LoadBootCommands(void)
{
int index, j, size;
char *cPtr;
p_memset((char*)boot_commands, 0, sizeof(boot_commands));
cPtr = &BootCommandSection;
size = MAX_ENV_SIZE_BYTES;
for (index = 0; (index < MAX_BOOT_COMMANDS) && size; ++index) {
for (j = 0; (j < MAX_INPUT_SIZE) && size; ++j) {
size--;
boot_commands[index][j] = *cPtr++;
if (!(boot_commands[index][j])) {
break;
}
}
}
}
/*
* .KB_C_FN_DEFINITION_START
* void ExecuteEnvironmentFunctions(void)
* This global function executes applicable entries in the environment.
* .KB_C_FN_DEFINITION_END
*/
void
ExecuteEnvironmentFunctions(void)
{
currentIndex = 0;
currentOffset = 0;
DumpBootCommands();
Bootloader(ReadCharFromEnvironment);
}
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