From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- arch/powerpc/boot/main.c | 284 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 284 insertions(+) create mode 100644 arch/powerpc/boot/main.c (limited to 'arch/powerpc/boot/main.c') diff --git a/arch/powerpc/boot/main.c b/arch/powerpc/boot/main.c new file mode 100644 index 0000000000..cae31a6e8f --- /dev/null +++ b/arch/powerpc/boot/main.c @@ -0,0 +1,284 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) Paul Mackerras 1997. + * + * Updates for PPC64 by Todd Inglett, Dave Engebretsen & Peter Bergner. + */ +#include +#include +#include "elf.h" +#include "page.h" +#include "string.h" +#include "stdio.h" +#include "ops.h" +#include "reg.h" + +struct addr_range { + void *addr; + unsigned long size; +}; + +#undef DEBUG + +static struct addr_range prep_kernel(void) +{ + char elfheader[256]; + unsigned char *vmlinuz_addr = (unsigned char *)_vmlinux_start; + unsigned long vmlinuz_size = _vmlinux_end - _vmlinux_start; + void *addr = 0; + struct elf_info ei; + long len; + int uncompressed_image = 0; + + len = partial_decompress(vmlinuz_addr, vmlinuz_size, + elfheader, sizeof(elfheader), 0); + /* assume uncompressed data if -1 is returned */ + if (len == -1) { + uncompressed_image = 1; + memcpy(elfheader, vmlinuz_addr, sizeof(elfheader)); + printf("No valid compressed data found, assume uncompressed data\n\r"); + } + + if (!parse_elf64(elfheader, &ei) && !parse_elf32(elfheader, &ei)) + fatal("Error: not a valid PPC32 or PPC64 ELF file!\n\r"); + + if (platform_ops.image_hdr) + platform_ops.image_hdr(elfheader); + + /* We need to alloc the memsize: gzip will expand the kernel + * text/data, then possible rubbish we don't care about. But + * the kernel bss must be claimed (it will be zero'd by the + * kernel itself) + */ + printf("Allocating 0x%lx bytes for kernel...\n\r", ei.memsize); + + if (platform_ops.vmlinux_alloc) { + addr = platform_ops.vmlinux_alloc(ei.memsize); + } else { + /* + * Check if the kernel image (without bss) would overwrite the + * bootwrapper. The device tree has been moved in fdt_init() + * to an area allocated with malloc() (somewhere past _end). + */ + if ((unsigned long)_start < ei.loadsize) + fatal("Insufficient memory for kernel at address 0!" + " (_start=%p, uncompressed size=%08lx)\n\r", + _start, ei.loadsize); + + if ((unsigned long)_end < ei.memsize) + fatal("The final kernel image would overwrite the " + "device tree\n\r"); + } + + if (uncompressed_image) { + memcpy(addr, vmlinuz_addr + ei.elfoffset, ei.loadsize); + printf("0x%lx bytes of uncompressed data copied\n\r", + ei.loadsize); + goto out; + } + + /* Finally, decompress the kernel */ + printf("Decompressing (0x%p <- 0x%p:0x%p)...\n\r", addr, + vmlinuz_addr, vmlinuz_addr+vmlinuz_size); + + len = partial_decompress(vmlinuz_addr, vmlinuz_size, + addr, ei.loadsize, ei.elfoffset); + + if (len < 0) + fatal("Decompression failed with error code %ld\n\r", len); + + if (len != ei.loadsize) + fatal("Decompression error: got 0x%lx bytes, expected 0x%lx.\n\r", + len, ei.loadsize); + + printf("Done! Decompressed 0x%lx bytes\n\r", len); +out: + flush_cache(addr, ei.loadsize); + + return (struct addr_range){addr, ei.memsize}; +} + +static struct addr_range prep_initrd(struct addr_range vmlinux, void *chosen, + unsigned long initrd_addr, + unsigned long initrd_size) +{ + /* If we have an image attached to us, it overrides anything + * supplied by the loader. */ + if (&_initrd_end > &_initrd_start) { + printf("Attached initrd image at 0x%p-0x%p\n\r", + _initrd_start, _initrd_end); + initrd_addr = (unsigned long)_initrd_start; + initrd_size = _initrd_end - _initrd_start; + } else if (initrd_size > 0) { + printf("Using loader supplied ramdisk at 0x%lx-0x%lx\n\r", + initrd_addr, initrd_addr + initrd_size); + } + + /* If there's no initrd at all, we're done */ + if (! initrd_size) + return (struct addr_range){0, 0}; + + /* + * If the initrd is too low it will be clobbered when the + * kernel relocates to its final location. In this case, + * allocate a safer place and move it. + */ + if (initrd_addr < vmlinux.size) { + void *old_addr = (void *)initrd_addr; + + printf("Allocating 0x%lx bytes for initrd ...\n\r", + initrd_size); + initrd_addr = (unsigned long)malloc(initrd_size); + if (! initrd_addr) + fatal("Can't allocate memory for initial " + "ramdisk !\n\r"); + printf("Relocating initrd 0x%lx <- 0x%p (0x%lx bytes)\n\r", + initrd_addr, old_addr, initrd_size); + memmove((void *)initrd_addr, old_addr, initrd_size); + } + + printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd_addr)); + + /* Tell the kernel initrd address via device tree */ + setprop_val(chosen, "linux,initrd-start", (u32)(initrd_addr)); + setprop_val(chosen, "linux,initrd-end", (u32)(initrd_addr+initrd_size)); + + return (struct addr_range){(void *)initrd_addr, initrd_size}; +} + +#ifdef __powerpc64__ +static void prep_esm_blob(struct addr_range vmlinux, void *chosen) +{ + unsigned long esm_blob_addr, esm_blob_size; + + /* Do we have an ESM (Enter Secure Mode) blob? */ + if (&_esm_blob_end <= &_esm_blob_start) + return; + + printf("Attached ESM blob at 0x%p-0x%p\n\r", + _esm_blob_start, _esm_blob_end); + esm_blob_addr = (unsigned long)_esm_blob_start; + esm_blob_size = _esm_blob_end - _esm_blob_start; + + /* + * If the ESM blob is too low it will be clobbered when the + * kernel relocates to its final location. In this case, + * allocate a safer place and move it. + */ + if (esm_blob_addr < vmlinux.size) { + void *old_addr = (void *)esm_blob_addr; + + printf("Allocating 0x%lx bytes for esm_blob ...\n\r", + esm_blob_size); + esm_blob_addr = (unsigned long)malloc(esm_blob_size); + if (!esm_blob_addr) + fatal("Can't allocate memory for ESM blob !\n\r"); + printf("Relocating ESM blob 0x%lx <- 0x%p (0x%lx bytes)\n\r", + esm_blob_addr, old_addr, esm_blob_size); + memmove((void *)esm_blob_addr, old_addr, esm_blob_size); + } + + /* Tell the kernel ESM blob address via device tree. */ + setprop_val(chosen, "linux,esm-blob-start", (u32)(esm_blob_addr)); + setprop_val(chosen, "linux,esm-blob-end", (u32)(esm_blob_addr + esm_blob_size)); +} +#else +static inline void prep_esm_blob(struct addr_range vmlinux, void *chosen) { } +#endif + +/* A buffer that may be edited by tools operating on a zImage binary so as to + * edit the command line passed to vmlinux (by setting /chosen/bootargs). + * The buffer is put in it's own section so that tools may locate it easier. + */ +static char cmdline[BOOT_COMMAND_LINE_SIZE] + __attribute__((__section__("__builtin_cmdline"))); + +static void prep_cmdline(void *chosen) +{ + unsigned int getline_timeout = 5000; + int v; + int n; + + /* Wait-for-input time */ + n = getprop(chosen, "linux,cmdline-timeout", &v, sizeof(v)); + if (n == sizeof(v)) + getline_timeout = v; + + if (cmdline[0] == '\0') + getprop(chosen, "bootargs", cmdline, BOOT_COMMAND_LINE_SIZE-1); + + printf("\n\rLinux/PowerPC load: %s", cmdline); + + /* If possible, edit the command line */ + if (console_ops.edit_cmdline && getline_timeout) + console_ops.edit_cmdline(cmdline, BOOT_COMMAND_LINE_SIZE, getline_timeout); + + printf("\n\r"); + + /* Put the command line back into the devtree for the kernel */ + setprop_str(chosen, "bootargs", cmdline); +} + +struct platform_ops platform_ops; +struct dt_ops dt_ops; +struct console_ops console_ops; +struct loader_info loader_info; + +void start(void) +{ + struct addr_range vmlinux, initrd; + kernel_entry_t kentry; + unsigned long ft_addr = 0; + void *chosen; + + /* Do this first, because malloc() could clobber the loader's + * command line. Only use the loader command line if a + * built-in command line wasn't set by an external tool */ + if ((loader_info.cmdline_len > 0) && (cmdline[0] == '\0')) + memmove(cmdline, loader_info.cmdline, + min(loader_info.cmdline_len, BOOT_COMMAND_LINE_SIZE-1)); + + if (console_ops.open && (console_ops.open() < 0)) + exit(); + if (platform_ops.fixups) + platform_ops.fixups(); + + printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r", + _start, get_sp()); + + /* Ensure that the device tree has a /chosen node */ + chosen = finddevice("/chosen"); + if (!chosen) + chosen = create_node(NULL, "chosen"); + + vmlinux = prep_kernel(); + initrd = prep_initrd(vmlinux, chosen, + loader_info.initrd_addr, loader_info.initrd_size); + prep_esm_blob(vmlinux, chosen); + prep_cmdline(chosen); + + printf("Finalizing device tree..."); + if (dt_ops.finalize) + ft_addr = dt_ops.finalize(); + if (ft_addr) + printf(" flat tree at 0x%lx\n\r", ft_addr); + else + printf(" using OF tree (promptr=%p)\n\r", loader_info.promptr); + + if (console_ops.close) + console_ops.close(); + + kentry = (kernel_entry_t) vmlinux.addr; + if (ft_addr) { + if(platform_ops.kentry) + platform_ops.kentry(ft_addr, vmlinux.addr); + else + kentry(ft_addr, 0, NULL); + } + else + kentry((unsigned long)initrd.addr, initrd.size, + loader_info.promptr); + + /* console closed so printf in fatal below may not work */ + fatal("Error: Linux kernel returned to zImage boot wrapper!\n\r"); +} -- cgit v1.2.3