310 lines
6.9 KiB
C
310 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/linkage.h>
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#include <linux/mm.h>
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#include <linux/memblock.h>
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#include <linux/pm.h>
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#include <linux/smp.h>
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#include <asm/bootinfo.h>
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#include <asm/reboot.h>
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#include <asm/setup.h>
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#include <asm/sibyte/board.h>
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#include <asm/smp-ops.h>
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#include <asm/fw/cfe/cfe_api.h>
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#include <asm/fw/cfe/cfe_error.h>
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/* Max ram addressable in 32-bit segments */
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#ifdef CONFIG_64BIT
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#define MAX_RAM_SIZE (~0ULL)
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#else
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#ifdef CONFIG_HIGHMEM
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#ifdef CONFIG_PHYS_ADDR_T_64BIT
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#define MAX_RAM_SIZE (~0ULL)
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#else
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#define MAX_RAM_SIZE (0xffffffffULL)
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#endif
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#else
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#define MAX_RAM_SIZE (0x1fffffffULL)
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#endif
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#endif
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int cfe_cons_handle;
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#ifdef CONFIG_BLK_DEV_INITRD
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extern unsigned long initrd_start, initrd_end;
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#endif
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static void __noreturn cfe_linux_exit(void *arg)
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{
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int warm = *(int *)arg;
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if (smp_processor_id()) {
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static int reboot_smp;
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/* Don't repeat the process from another CPU */
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if (!reboot_smp) {
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/* Get CPU 0 to do the cfe_exit */
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reboot_smp = 1;
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smp_call_function(cfe_linux_exit, arg, 0);
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}
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} else {
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printk("Passing control back to CFE...\n");
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cfe_exit(warm, 0);
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printk("cfe_exit returned??\n");
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}
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while (1);
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}
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static void __noreturn cfe_linux_restart(char *command)
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{
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static const int zero;
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cfe_linux_exit((void *)&zero);
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}
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static void __noreturn cfe_linux_halt(void)
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{
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static const int one = 1;
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cfe_linux_exit((void *)&one);
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}
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static __init void prom_meminit(void)
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{
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u64 addr, size, type; /* regardless of PHYS_ADDR_T_64BIT */
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int mem_flags = 0;
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unsigned int idx;
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int rd_flag;
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#ifdef CONFIG_BLK_DEV_INITRD
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unsigned long initrd_pstart;
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unsigned long initrd_pend;
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initrd_pstart = CPHYSADDR(initrd_start);
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initrd_pend = CPHYSADDR(initrd_end);
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if (initrd_start &&
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((initrd_pstart > MAX_RAM_SIZE)
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|| (initrd_pend > MAX_RAM_SIZE))) {
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panic("initrd out of addressable memory");
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}
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#endif /* INITRD */
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for (idx = 0; cfe_enummem(idx, mem_flags, &addr, &size, &type) != CFE_ERR_NOMORE;
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idx++) {
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rd_flag = 0;
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if (type == CFE_MI_AVAILABLE) {
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/*
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* See if this block contains (any portion of) the
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* ramdisk
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*/
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#ifdef CONFIG_BLK_DEV_INITRD
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if (initrd_start) {
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if ((initrd_pstart > addr) &&
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(initrd_pstart < (addr + size))) {
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memblock_add(addr,
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initrd_pstart - addr);
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rd_flag = 1;
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}
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if ((initrd_pend > addr) &&
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(initrd_pend < (addr + size))) {
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memblock_add(initrd_pend,
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(addr + size) - initrd_pend);
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rd_flag = 1;
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}
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}
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#endif
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if (!rd_flag) {
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if (addr > MAX_RAM_SIZE)
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continue;
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if (addr+size > MAX_RAM_SIZE)
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size = MAX_RAM_SIZE - (addr+size) + 1;
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/*
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* memcpy/__copy_user prefetch, which
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* will cause a bus error for
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* KSEG/KUSEG addrs not backed by RAM.
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* Hence, reserve some padding for the
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* prefetch distance.
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*/
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if (size > 512)
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size -= 512;
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memblock_add(addr, size);
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}
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}
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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if (initrd_start) {
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memblock_add(initrd_pstart, initrd_pend - initrd_pstart);
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memblock_reserve(initrd_pstart, initrd_pend - initrd_pstart);
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}
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#endif
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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static int __init initrd_setup(char *str)
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{
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char rdarg[64];
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int idx;
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char *tmp, *endptr;
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unsigned long initrd_size;
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/* Make a copy of the initrd argument so we can smash it up here */
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for (idx = 0; idx < sizeof(rdarg)-1; idx++) {
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if (!str[idx] || (str[idx] == ' ')) break;
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rdarg[idx] = str[idx];
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}
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rdarg[idx] = 0;
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str = rdarg;
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/*
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*Initrd location comes in the form "<hex size of ramdisk in bytes>@<location in memory>"
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* e.g. initrd=3abfd@80010000. This is set up by the loader.
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*/
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for (tmp = str; *tmp != '@'; tmp++) {
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if (!*tmp) {
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goto fail;
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}
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}
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*tmp = 0;
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tmp++;
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if (!*tmp) {
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goto fail;
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}
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initrd_size = simple_strtoul(str, &endptr, 16);
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if (*endptr) {
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*(tmp-1) = '@';
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goto fail;
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}
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*(tmp-1) = '@';
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initrd_start = simple_strtoul(tmp, &endptr, 16);
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if (*endptr) {
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goto fail;
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}
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initrd_end = initrd_start + initrd_size;
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printk("Found initrd of %lx@%lx\n", initrd_size, initrd_start);
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return 1;
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fail:
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printk("Bad initrd argument. Disabling initrd\n");
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initrd_start = 0;
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initrd_end = 0;
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return 1;
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}
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#endif
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extern const struct plat_smp_ops sb_smp_ops;
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extern const struct plat_smp_ops bcm1480_smp_ops;
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/*
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* prom_init is called just after the cpu type is determined, from setup_arch()
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*/
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void __init prom_init(void)
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{
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uint64_t cfe_ept, cfe_handle;
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unsigned int cfe_eptseal;
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int argc = fw_arg0;
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char **envp = (char **) fw_arg2;
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int *prom_vec = (int *) fw_arg3;
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_machine_restart = cfe_linux_restart;
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_machine_halt = cfe_linux_halt;
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pm_power_off = cfe_linux_halt;
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/*
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* Check if a loader was used; if NOT, the 4 arguments are
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* what CFE gives us (handle, 0, EPT and EPTSEAL)
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*/
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if (argc < 0) {
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cfe_handle = (uint64_t)(long)argc;
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cfe_ept = (long)envp;
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cfe_eptseal = (uint32_t)(unsigned long)prom_vec;
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} else {
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if ((int32_t)(long)prom_vec < 0) {
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/*
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* Old loader; all it gives us is the handle,
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* so use the "known" entrypoint and assume
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* the seal.
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*/
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cfe_handle = (uint64_t)(long)prom_vec;
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cfe_ept = (uint64_t)((int32_t)0x9fc00500);
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cfe_eptseal = CFE_EPTSEAL;
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} else {
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/*
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* Newer loaders bundle the handle/ept/eptseal
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* Note: prom_vec is in the loader's useg
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* which is still alive in the TLB.
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*/
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cfe_handle = (uint64_t)((int32_t *)prom_vec)[0];
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cfe_ept = (uint64_t)((int32_t *)prom_vec)[2];
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cfe_eptseal = (unsigned int)((uint32_t *)prom_vec)[3];
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}
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}
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if (cfe_eptseal != CFE_EPTSEAL) {
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/* too early for panic to do any good */
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printk("CFE's entrypoint seal doesn't match. Spinning.");
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while (1) ;
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}
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cfe_init(cfe_handle, cfe_ept);
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/*
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* Get the handle for (at least) prom_putchar, possibly for
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* boot console
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*/
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cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
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if (cfe_getenv("LINUX_CMDLINE", arcs_cmdline, COMMAND_LINE_SIZE) < 0) {
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if (argc >= 0) {
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/* The loader should have set the command line */
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/* too early for panic to do any good */
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printk("LINUX_CMDLINE not defined in cfe.");
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while (1) ;
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}
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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{
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char *ptr;
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/* Need to find out early whether we've got an initrd. So scan
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the list looking now */
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for (ptr = arcs_cmdline; *ptr; ptr++) {
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while (*ptr == ' ') {
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ptr++;
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}
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if (!strncmp(ptr, "initrd=", 7)) {
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initrd_setup(ptr+7);
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break;
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} else {
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while (*ptr && (*ptr != ' ')) {
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ptr++;
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}
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}
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}
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}
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#endif /* CONFIG_BLK_DEV_INITRD */
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/* Not sure this is needed, but it's the safe way. */
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arcs_cmdline[COMMAND_LINE_SIZE-1] = 0;
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prom_meminit();
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#if defined(CONFIG_SIBYTE_BCM112X) || defined(CONFIG_SIBYTE_SB1250)
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register_smp_ops(&sb_smp_ops);
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#endif
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#ifdef CONFIG_SIBYTE_BCM1x80
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register_smp_ops(&bcm1480_smp_ops);
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#endif
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}
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void prom_putchar(char c)
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{
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int ret;
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while ((ret = cfe_write(cfe_cons_handle, &c, 1)) == 0)
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;
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}
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