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// SPDX-License-Identifier: GPL-2.0-only
/*
* Common prep/pmac/chrp boot and setup code.
*/
#include <linux/module.h>
#include <linux/string.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/initrd.h>
#include <linux/tty.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/cpu.h>
#include <linux/console.h>
#include <linux/memblock.h>
#include <linux/export.h>
#include <linux/nvram.h>
#include <linux/pgtable.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/processor.h>
#include <asm/setup.h>
#include <asm/smp.h>
#include <asm/elf.h>
#include <asm/cputable.h>
#include <asm/bootx.h>
#include <asm/btext.h>
#include <asm/machdep.h>
#include <linux/uaccess.h>
#include <asm/pmac_feature.h>
#include <asm/sections.h>
#include <asm/nvram.h>
#include <asm/xmon.h>
#include <asm/time.h>
#include <asm/serial.h>
#include <asm/udbg.h>
#include <asm/code-patching.h>
#include <asm/cpu_has_feature.h>
#include <asm/asm-prototypes.h>
#include <asm/kdump.h>
#include <asm/feature-fixups.h>
#include <asm/early_ioremap.h>
#include "setup.h"
#define DBG(fmt...)
extern void bootx_init(unsigned long r4, unsigned long phys);
int boot_cpuid_phys;
EXPORT_SYMBOL_GPL(boot_cpuid_phys);
int smp_hw_index[NR_CPUS];
EXPORT_SYMBOL(smp_hw_index);
unsigned int DMA_MODE_READ;
unsigned int DMA_MODE_WRITE;
EXPORT_SYMBOL(DMA_MODE_READ);
EXPORT_SYMBOL(DMA_MODE_WRITE);
/*
* This is run before start_kernel(), the kernel has been relocated
* and we are running with enough of the MMU enabled to have our
* proper kernel virtual addresses
*
* We do the initial parsing of the flat device-tree and prepares
* for the MMU to be fully initialized.
*/
notrace void __init machine_init(u64 dt_ptr)
{
struct ppc_inst *addr = (struct ppc_inst *)patch_site_addr(&patch__memset_nocache);
struct ppc_inst insn;
/* Configure static keys first, now that we're relocated. */
setup_feature_keys();
early_ioremap_init();
/* Enable early debugging if any specified (see udbg.h) */
udbg_early_init();
patch_instruction_site(&patch__memcpy_nocache, ppc_inst(PPC_INST_NOP));
create_cond_branch(&insn, addr, branch_target(addr), 0x820000);
patch_instruction(addr, insn); /* replace b by bne cr0 */
/* Do some early initialization based on the flat device tree */
early_init_devtree(__va(dt_ptr));
early_init_mmu();
setup_kdump_trampoline();
}
/* Checks "l2cr=xxxx" command-line option */
static int __init ppc_setup_l2cr(char *str)
{
if (cpu_has_feature(CPU_FTR_L2CR)) {
unsigned long val = simple_strtoul(str, NULL, 0);
printk(KERN_INFO "l2cr set to %lx\n", val);
_set_L2CR(0); /* force invalidate by disable cache */
_set_L2CR(val); /* and enable it */
}
return 1;
}
__setup("l2cr=", ppc_setup_l2cr);
/* Checks "l3cr=xxxx" command-line option */
static int __init ppc_setup_l3cr(char *str)
{
if (cpu_has_feature(CPU_FTR_L3CR)) {
unsigned long val = simple_strtoul(str, NULL, 0);
printk(KERN_INFO "l3cr set to %lx\n", val);
_set_L3CR(val); /* and enable it */
}
return 1;
}
__setup("l3cr=", ppc_setup_l3cr);
static int __init ppc_init(void)
{
/* clear the progress line */
if (ppc_md.progress)
ppc_md.progress(" ", 0xffff);
/* call platform init */
if (ppc_md.init != NULL) {
ppc_md.init();
}
return 0;
}
arch_initcall(ppc_init);
static void *__init alloc_stack(void)
{
void *ptr = memblock_alloc(THREAD_SIZE, THREAD_ALIGN);
if (!ptr)
panic("cannot allocate %d bytes for stack at %pS\n",
THREAD_SIZE, (void *)_RET_IP_);
return ptr;
}
void __init irqstack_early_init(void)
{
unsigned int i;
if (IS_ENABLED(CONFIG_VMAP_STACK))
return;
/* interrupt stacks must be in lowmem, we get that for free on ppc32
* as the memblock is limited to lowmem by default */
for_each_possible_cpu(i) {
softirq_ctx[i] = alloc_stack();
hardirq_ctx[i] = alloc_stack();
}
}
#ifdef CONFIG_VMAP_STACK
void *emergency_ctx[NR_CPUS] __ro_after_init = {[0] = &init_stack};
void __init emergency_stack_init(void)
{
unsigned int i;
for_each_possible_cpu(i)
emergency_ctx[i] = alloc_stack();
}
#endif
#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
void __init exc_lvl_early_init(void)
{
unsigned int i, hw_cpu;
/* interrupt stacks must be in lowmem, we get that for free on ppc32
* as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */
for_each_possible_cpu(i) {
#ifdef CONFIG_SMP
hw_cpu = get_hard_smp_processor_id(i);
#else
hw_cpu = 0;
#endif
critirq_ctx[hw_cpu] = alloc_stack();
#ifdef CONFIG_BOOKE
dbgirq_ctx[hw_cpu] = alloc_stack();
mcheckirq_ctx[hw_cpu] = alloc_stack();
#endif
}
}
#endif
void __init setup_power_save(void)
{
#ifdef CONFIG_PPC_BOOK3S_32
if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
cpu_has_feature(CPU_FTR_CAN_NAP))
ppc_md.power_save = ppc6xx_idle;
#endif
#ifdef CONFIG_E500
if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
cpu_has_feature(CPU_FTR_CAN_NAP))
ppc_md.power_save = e500_idle;
#endif
}
__init void initialize_cache_info(void)
{
/*
* Set cache line size based on type of cpu as a default.
* Systems with OF can look in the properties on the cpu node(s)
* for a possibly more accurate value.
*/
dcache_bsize = cur_cpu_spec->dcache_bsize;
icache_bsize = cur_cpu_spec->icache_bsize;
}
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