/* SPARC code for booting linux 2.6 * * (C) Copyright 2007 * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com. * * SPDX-License-Identifier: GPL-2.0+ */ #include <common.h> #include <command.h> #include <asm/byteorder.h> #include <asm/prom.h> #include <asm/cache.h> #include <image.h> #define PRINT_KERNEL_HEADER extern image_header_t header; extern void srmmu_init_cpu(unsigned int entry); extern void prepare_bootargs(char *bootargs); #ifdef CONFIG_USB_UHCI extern int usb_lowlevel_stop(int index); #endif /* sparc kernel argument (the ROM vector) */ struct linux_romvec *kernel_arg_promvec; /* page szie is 4k */ #define PAGE_SIZE 0x1000 #define RAMDISK_IMAGE_START_MASK 0x07FF #define RAMDISK_PROMPT_FLAG 0x8000 #define RAMDISK_LOAD_FLAG 0x4000 struct __attribute__ ((packed)) { char traptable[PAGE_SIZE]; char swapper_pg_dir[PAGE_SIZE]; char pg0[PAGE_SIZE]; char pg1[PAGE_SIZE]; char pg2[PAGE_SIZE]; char pg3[PAGE_SIZE]; char empty_bad_page[PAGE_SIZE]; char empty_bad_page_table[PAGE_SIZE]; char empty_zero_page[PAGE_SIZE]; unsigned char hdr[4]; /* ascii "HdrS" */ /* 00.02.06.0b is for Linux kernel 2.6.11 */ unsigned char linuxver_mega_major; unsigned char linuxver_major; unsigned char linuxver_minor; unsigned char linuxver_revision; /* header version 0x0203 */ unsigned short hdr_ver; union __attribute__ ((packed)) { struct __attribute__ ((packed)) { unsigned short root_flags; unsigned short root_dev; unsigned short ram_flags; unsigned int sparc_ramdisk_image; unsigned int sparc_ramdisk_size; unsigned int reboot_command; unsigned int resv[3]; unsigned int end; } ver_0203; } hdr_input; } *linux_hdr; /* temporary initrd image holder */ image_header_t ihdr; void arch_lmb_reserve(struct lmb *lmb) { /* Reserve the space used by PROM and stack. This is done * to avoid that the RAM image is copied over stack or * PROM. */ lmb_reserve(lmb, CONFIG_SYS_RELOC_MONITOR_BASE, CONFIG_SYS_RAM_END); } /* boot the linux kernel */ int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t * images) { char *bootargs; ulong rd_len; void (*kernel) (struct linux_romvec *, void *); int ret; /* * allow the PREP bootm subcommand, it is required for bootm to work */ if (flag & BOOTM_STATE_OS_PREP) return 0; if ((flag != 0) && (flag != BOOTM_STATE_OS_GO)) return 1; /* Get virtual address of kernel start */ linux_hdr = (void *)images->os.load; /* */ kernel = (void (*)(struct linux_romvec *, void *))images->ep; /* check for a SPARC kernel */ if ((linux_hdr->hdr[0] != 'H') || (linux_hdr->hdr[1] != 'd') || (linux_hdr->hdr[2] != 'r') || (linux_hdr->hdr[3] != 'S')) { puts("Error reading header of SPARC Linux kernel, aborting\n"); goto error; } #ifdef PRINT_KERNEL_HEADER printf("## Found SPARC Linux kernel %d.%d.%d ...\n", linux_hdr->linuxver_major, linux_hdr->linuxver_minor, linux_hdr->linuxver_revision); #endif #ifdef CONFIG_USB_UHCI usb_lowlevel_stop(); #endif /* set basic boot params in kernel header now that it has been * extracted and is writeable. */ ret = image_setup_linux(images); if (ret) { puts("### Failed to relocate RAM disk\n"); goto error; } /* Calc length of RAM disk, if zero no ramdisk available */ rd_len = images->rd_end - images->rd_start; if (rd_len) { /* Update SPARC kernel header so that Linux knows * what is going on and where to find RAM disk. * * Set INITRD Image address relative to RAM Start */ linux_hdr->hdr_input.ver_0203.sparc_ramdisk_image = images->initrd_start - CONFIG_SYS_RAM_BASE; linux_hdr->hdr_input.ver_0203.sparc_ramdisk_size = rd_len; /* Clear READ ONLY flag if set to non-zero */ linux_hdr->hdr_input.ver_0203.root_flags = 1; /* Set root device to: Root_RAM0 */ linux_hdr->hdr_input.ver_0203.root_dev = 0x100; linux_hdr->hdr_input.ver_0203.ram_flags = 0; } else { /* NOT using RAMDISK image, overwriting kernel defaults */ linux_hdr->hdr_input.ver_0203.sparc_ramdisk_image = 0; linux_hdr->hdr_input.ver_0203.sparc_ramdisk_size = 0; /* Leave to kernel defaults linux_hdr->hdr_input.ver_0203.root_flags = 1; linux_hdr->hdr_input.ver_0203.root_dev = 0; linux_hdr->hdr_input.ver_0203.ram_flags = 0; */ } /* Copy bootargs from bootargs variable to kernel readable area */ bootargs = getenv("bootargs"); prepare_bootargs(bootargs); /* turn on mmu & setup context table & page table for process 0 (kernel) */ srmmu_init_cpu((unsigned int)kernel); /* Enter SPARC Linux kernel * From now on the only code in u-boot that will be * executed is the PROM code. */ kernel(kernel_arg_promvec, (void *)images->ep); /* It will never come to this... */ while (1) ; error: return 1; }