GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2008 - 2013 Tensilica Inc.
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* (C) Copyright 2014 Cadence Design Systems Inc.
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*/
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#include <common.h>
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#include <command.h>
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#include <cpu_func.h>
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#include <env.h>
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#include <u-boot/zlib.h>
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#include <asm/byteorder.h>
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#include <asm/addrspace.h>
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#include <asm/bootparam.h>
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#include <asm/cache.h>
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#include <image.h>
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* Setup boot-parameters.
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*/
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static struct bp_tag *setup_first_tag(struct bp_tag *params)
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{
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params->id = BP_TAG_FIRST;
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params->size = sizeof(long);
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*(unsigned long *)¶ms->data = BP_VERSION;
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return bp_tag_next(params);
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}
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static struct bp_tag *setup_last_tag(struct bp_tag *params)
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{
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params->id = BP_TAG_LAST;
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params->size = 0;
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return bp_tag_next(params);
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}
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static struct bp_tag *setup_memory_tag(struct bp_tag *params)
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{
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struct bd_info *bd = gd->bd;
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struct meminfo *mem;
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params->id = BP_TAG_MEMORY;
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params->size = sizeof(struct meminfo);
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mem = (struct meminfo *)params->data;
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mem->type = MEMORY_TYPE_CONVENTIONAL;
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mem->start = bd->bi_memstart;
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mem->end = bd->bi_memstart + bd->bi_memsize;
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printf(" MEMORY: tag:0x%04x, type:0X%lx, start:0X%lx, end:0X%lx\n",
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BP_TAG_MEMORY, mem->type, mem->start, mem->end);
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return bp_tag_next(params);
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}
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static struct bp_tag *setup_commandline_tag(struct bp_tag *params,
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char *cmdline)
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{
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int len;
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if (!cmdline)
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return params;
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len = strlen(cmdline);
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params->id = BP_TAG_COMMAND_LINE;
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params->size = (len + 3) & -4;
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strcpy((char *)params->data, cmdline);
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printf(" COMMAND_LINE: tag:0x%04x, size:%u, data:'%s'\n",
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BP_TAG_COMMAND_LINE, params->size, cmdline);
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return bp_tag_next(params);
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}
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static struct bp_tag *setup_ramdisk_tag(struct bp_tag *params,
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unsigned long rd_start,
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unsigned long rd_end)
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{
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struct meminfo *mem;
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if (rd_start == rd_end)
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return params;
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/* Add a single banked memory */
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params->id = BP_TAG_INITRD;
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params->size = sizeof(struct meminfo);
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mem = (struct meminfo *)params->data;
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mem->type = MEMORY_TYPE_CONVENTIONAL;
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mem->start = PHYSADDR(rd_start);
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mem->end = PHYSADDR(rd_end);
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printf(" INITRD: tag:0x%x, type:0X%04lx, start:0X%lx, end:0X%lx\n",
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BP_TAG_INITRD, mem->type, mem->start, mem->end);
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return bp_tag_next(params);
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}
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static struct bp_tag *setup_serial_tag(struct bp_tag *params)
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{
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params->id = BP_TAG_SERIAL_BAUDRATE;
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params->size = sizeof(unsigned long);
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params->data[0] = gd->baudrate;
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printf(" SERIAL_BAUDRATE: tag:0x%04x, size:%u, baudrate:%lu\n",
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BP_TAG_SERIAL_BAUDRATE, params->size, params->data[0]);
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return bp_tag_next(params);
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}
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#ifdef CONFIG_OF_LIBFDT
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static struct bp_tag *setup_fdt_tag(struct bp_tag *params, void *fdt_start)
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{
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params->id = BP_TAG_FDT;
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params->size = sizeof(unsigned long);
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params->data[0] = (unsigned long)fdt_start;
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printf(" FDT: tag:0x%04x, size:%u, start:0x%lx\n",
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BP_TAG_FDT, params->size, params->data[0]);
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return bp_tag_next(params);
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}
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#endif
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/*
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* Boot Linux.
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*/
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int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
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{
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struct bp_tag *params, *params_start;
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ulong initrd_start, initrd_end;
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char *commandline = env_get("bootargs");
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if (!(flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)))
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return 0;
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show_boot_progress(15);
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if (images->rd_start) {
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initrd_start = images->rd_start;
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initrd_end = images->rd_end;
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} else {
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initrd_start = 0;
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initrd_end = 0;
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}
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params_start = (struct bp_tag *)gd->bd->bi_boot_params;
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params = params_start;
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params = setup_first_tag(params);
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params = setup_memory_tag(params);
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params = setup_commandline_tag(params, commandline);
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params = setup_serial_tag(params);
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if (initrd_start)
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params = setup_ramdisk_tag(params, initrd_start, initrd_end);
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#ifdef CONFIG_OF_LIBFDT
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if (images->ft_addr)
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params = setup_fdt_tag(params, images->ft_addr);
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#endif
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printf("\n");
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params = setup_last_tag(params);
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show_boot_progress(15);
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printf("Transferring Control to Linux @0x%08lx ...\n\n",
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(ulong)images->ep);
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flush_dcache_range((unsigned long)params_start, (unsigned long)params);
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if (flag & BOOTM_STATE_OS_FAKE_GO)
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return 0;
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/*
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* _start() in vmlinux expects boot params in register a2.
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* NOTE:
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* Disable/delete your u-boot breakpoints before stepping into linux.
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*/
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asm volatile ("mov a2, %0\n\t"
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"jx %1\n\t"
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: : "a" (params_start), "a" (images->ep)
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: "a2");
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/* Does not return */
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return 1;
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}
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