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  • /*
     * (C) Copyright 2003
     * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
     *
    
     * SPDX-License-Identifier:	GPL-2.0+
    
     */
    
    #include <common.h>
    #include <command.h>
    #include <image.h>
    
    #include <asm/byteorder.h>
    #include <asm/addrspace.h>
    
    
    #define	LINUX_MAX_ENVS		256
    #define	LINUX_MAX_ARGS		256
    
    
    #if defined(CONFIG_QEMU_MALTA)
    #define mips_boot_qemu_malta	1
    #else
    #define mips_boot_qemu_malta	0
    #endif
    
    
    static int linux_argc;
    static char **linux_argv;
    
    static char **linux_env;
    static char *linux_env_p;
    static int linux_env_idx;
    
    static ulong arch_get_sp(void)
    {
    	ulong ret;
    
    	__asm__ __volatile__("move %0, $sp" : "=r"(ret) : );
    
    	return ret;
    }
    
    void arch_lmb_reserve(struct lmb *lmb)
    {
    	ulong sp;
    
    	sp = arch_get_sp();
    	debug("## Current stack ends at 0x%08lx\n", sp);
    
    	/* adjust sp by 4K to be safe */
    	sp -= 4096;
    	lmb_reserve(lmb, sp, CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp);
    }
    
    
    static void linux_cmdline_init(void)
    {
    	linux_argc = 1;
    	linux_argv = (char **)UNCACHED_SDRAM(gd->bd->bi_boot_params);
    	linux_argv[0] = 0;
    	linux_argp = (char *)(linux_argv + LINUX_MAX_ARGS);
    }
    
    static void linux_cmdline_set(const char *value, size_t len)
    {
    	linux_argv[linux_argc] = linux_argp;
    	memcpy(linux_argp, value, len);
    	linux_argp[len] = 0;
    
    	linux_argp += len + 1;
    	linux_argc++;
    }
    
    static void linux_cmdline_dump(void)
    {
    	int i;
    
    	debug("## cmdline argv at 0x%p, argp at 0x%p\n",
    	      linux_argv, linux_argp);
    
    	for (i = 1; i < linux_argc; i++)
    		debug("   arg %03d: %s\n", i, linux_argv[i]);
    }
    
    static void boot_cmdline_linux(bootm_headers_t *images)
    {
    	const char *bootargs, *next, *quote;
    
    	linux_cmdline_init();
    
    	bootargs = getenv("bootargs");
    	if (!bootargs)
    		return;
    
    	next = bootargs;
    
    	while (bootargs && *bootargs && linux_argc < LINUX_MAX_ARGS) {
    		quote = strchr(bootargs, '"');
    		next = strchr(bootargs, ' ');
    
    		while (next && quote && quote < next) {
    			/*
    			 * we found a left quote before the next blank
    			 * now we have to find the matching right quote
    			 */
    			next = strchr(quote + 1, '"');
    			if (next) {
    				quote = strchr(next + 1, '"');
    				next = strchr(next + 1, ' ');
    			}
    		}
    
    		if (!next)
    			next = bootargs + strlen(bootargs);
    
    		linux_cmdline_set(bootargs, next - bootargs);
    
    		if (*next)
    			next++;
    
    		bootargs = next;
    	}
    
    	linux_cmdline_dump();
    }
    
    
    static void linux_env_init(void)
    {
    	linux_env = (char **)(((ulong) linux_argp + 15) & ~15);
    	linux_env[0] = 0;
    	linux_env_p = (char *)(linux_env + LINUX_MAX_ENVS);
    	linux_env_idx = 0;
    }
    
    static void linux_env_set(const char *env_name, const char *env_val)
    {
    	if (linux_env_idx < LINUX_MAX_ENVS - 1) {
    		linux_env[linux_env_idx] = linux_env_p;
    
    		strcpy(linux_env_p, env_name);
    		linux_env_p += strlen(env_name);
    
    
    		if (mips_boot_qemu_malta) {
    			linux_env_p++;
    			linux_env[++linux_env_idx] = linux_env_p;
    		} else {
    			*linux_env_p++ = '=';
    		}
    
    
    		strcpy(linux_env_p, env_val);
    		linux_env_p += strlen(env_val);
    
    		linux_env_p++;
    		linux_env[++linux_env_idx] = 0;
    	}
    }
    
    
    static void boot_prep_linux(bootm_headers_t *images)
    
    	char env_buf[12];
    
    
    #ifdef CONFIG_MEMSIZE_IN_BYTES
    
    	sprintf(env_buf, "%lu", (ulong)gd->ram_size);
    	debug("## Giving linux memsize in bytes, %lu\n", (ulong)gd->ram_size);
    
    	sprintf(env_buf, "%lu", (ulong)(gd->ram_size >> 20));
    	debug("## Giving linux memsize in MB, %lu\n",
    
    	      (ulong)(gd->ram_size >> 20));
    
    #endif /* CONFIG_MEMSIZE_IN_BYTES */
    
    	rd_start = UNCACHED_SDRAM(images->initrd_start);
    	rd_size = images->initrd_end - images->initrd_start;
    
    
    	linux_env_set("memsize", env_buf);
    
    	sprintf(env_buf, "0x%08lX", rd_start);
    
    	linux_env_set("initrd_start", env_buf);
    
    	sprintf(env_buf, "0x%lX", rd_size);
    
    	linux_env_set("initrd_size", env_buf);
    
    	sprintf(env_buf, "0x%08X", (uint) (gd->bd->bi_flashstart));
    	linux_env_set("flash_start", env_buf);
    
    	sprintf(env_buf, "0x%X", (uint) (gd->bd->bi_flashsize));
    	linux_env_set("flash_size", env_buf);
    
    		linux_env_set("ethaddr", cp);
    
    	cp = getenv("eth1addr");
    
    
    	if (mips_boot_qemu_malta)
    		linux_env_set("modetty0", "38400n8r");
    
    }
    
    static void boot_jump_linux(bootm_headers_t *images)
    {
    
    	typedef void __noreturn (*kernel_entry_t)(int, ulong, ulong, ulong);
    	kernel_entry_t kernel = (kernel_entry_t) images->ep;
    
    	debug("## Transferring control to Linux (at address %p) ...\n", kernel);
    
    
    	bootstage_mark(BOOTSTAGE_ID_RUN_OS);
    
    
    	if (mips_boot_qemu_malta)
    		linux_extra = gd->ram_size;
    
    
    	/* we assume that the kernel is in place */
    	printf("\nStarting kernel ...\n\n");
    
    
    	kernel(linux_argc, (ulong)linux_argv, (ulong)linux_env, linux_extra);
    
    }
    
    int do_bootm_linux(int flag, int argc, char * const argv[],
    			bootm_headers_t *images)
    {
    
    	/* No need for those on MIPS */
    
    	if (flag & BOOTM_STATE_OS_BD_T)
    
    	if (flag & BOOTM_STATE_OS_CMDLINE) {
    		boot_cmdline_linux(images);
    		return 0;
    	}
    
    
    	if (flag & BOOTM_STATE_OS_PREP) {
    		boot_prep_linux(images);
    		return 0;
    	}
    
    	if (flag & BOOTM_STATE_OS_GO) {
    		boot_jump_linux(images);
    		return 0;
    	}
    
    	boot_cmdline_linux(images);
    
    	boot_prep_linux(images);
    
    	boot_jump_linux(images);