87 lines
1.7 KiB
C
87 lines
1.7 KiB
C
/*
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* Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com>
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*
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* Modified from arch/mips/pnx833x/common/prom.c.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/serial_reg.h>
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#include <asm/bootinfo.h>
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#include <loongson1.h>
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#include <prom.h>
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int prom_argc;
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char **prom_argv, **prom_envp;
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unsigned long memsize, highmemsize;
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char *prom_getenv(char *envname)
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{
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char **env = prom_envp;
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int i;
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i = strlen(envname);
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while (*env) {
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if (strncmp(envname, *env, i) == 0 && *(*env+i) == '=')
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return *env + i + 1;
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env++;
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}
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return 0;
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}
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static inline unsigned long env_or_default(char *env, unsigned long dfl)
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{
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char *str = prom_getenv(env);
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return str ? simple_strtol(str, 0, 0) : dfl;
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}
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void __init prom_init_cmdline(void)
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{
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char *c = &(arcs_cmdline[0]);
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int i;
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for (i = 1; i < prom_argc; i++) {
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strcpy(c, prom_argv[i]);
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c += strlen(prom_argv[i]);
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if (i < prom_argc-1)
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*c++ = ' ';
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}
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*c = 0;
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}
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void __init prom_init(void)
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{
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prom_argc = fw_arg0;
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prom_argv = (char **)fw_arg1;
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prom_envp = (char **)fw_arg2;
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prom_init_cmdline();
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memsize = env_or_default("memsize", DEFAULT_MEMSIZE);
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highmemsize = env_or_default("highmemsize", 0x0);
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}
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void __init prom_free_prom_memory(void)
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{
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}
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#define PORT(offset) (u8 *)(KSEG1ADDR(LS1X_UART0_BASE + offset))
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void prom_putchar(char c)
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{
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int timeout;
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timeout = 1024;
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while (((readb(PORT(UART_LSR)) & UART_LSR_THRE) == 0)
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&& (timeout-- > 0))
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;
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writeb(c, PORT(UART_TX));
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}
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