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Diffstat (limited to 'arch/powerpc/kernel/setup_32.c')
-rw-r--r--arch/powerpc/kernel/setup_32.c144
1 files changed, 52 insertions, 92 deletions
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index 2f88f6cf1a42..5a1bf501fbe1 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Common prep/pmac/chrp boot and setup code.
*/
@@ -17,11 +18,13 @@
#include <linux/console.h>
#include <linux/memblock.h>
#include <linux/export.h>
+#include <linux/nvram.h>
+#include <linux/pgtable.h>
+#include <linux/of_fdt.h>
+#include <linux/irq.h>
#include <asm/io.h>
-#include <asm/prom.h>
#include <asm/processor.h>
-#include <asm/pgtable.h>
#include <asm/setup.h>
#include <asm/smp.h>
#include <asm/elf.h>
@@ -37,8 +40,14 @@
#include <asm/time.h>
#include <asm/serial.h>
#include <asm/udbg.h>
-#include <asm/code-patching.h>
+#include <asm/text-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...)
@@ -50,43 +59,13 @@ EXPORT_SYMBOL_GPL(boot_cpuid_phys);
int smp_hw_index[NR_CPUS];
EXPORT_SYMBOL(smp_hw_index);
-unsigned long ISA_DMA_THRESHOLD;
unsigned int DMA_MODE_READ;
unsigned int DMA_MODE_WRITE;
-EXPORT_SYMBOL(ISA_DMA_THRESHOLD);
EXPORT_SYMBOL(DMA_MODE_READ);
EXPORT_SYMBOL(DMA_MODE_WRITE);
/*
- * We're called here very early in the boot.
- *
- * Note that the kernel may be running at an address which is different
- * from the address that it was linked at, so we must use RELOC/PTRRELOC
- * to access static data (including strings). -- paulus
- */
-notrace unsigned long __init early_init(unsigned long dt_ptr)
-{
- unsigned long offset = reloc_offset();
-
- /* First zero the BSS -- use memset_io, some platforms don't have
- * caches on yet */
- memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
- __bss_stop - __bss_start);
-
- /*
- * Identify the CPU type and fix up code sections
- * that depend on which cpu we have.
- */
- identify_cpu(offset, mfspr(SPRN_PVR));
-
- apply_feature_fixups();
-
- return KERNELBASE + offset;
-}
-
-
-/*
* 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
@@ -94,18 +73,23 @@ notrace unsigned long __init early_init(unsigned long dt_ptr)
* We do the initial parsing of the flat device-tree and prepares
* for the MMU to be fully initialized.
*/
-extern unsigned int memset_nocache_branch; /* Insn to be replaced by NOP */
-
notrace void __init machine_init(u64 dt_ptr)
{
+ u32 *addr = (u32 *)patch_site_addr(&patch__memset_nocache);
+ ppc_inst_t 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((unsigned int *)&memcpy, PPC_INST_NOP);
- patch_instruction(&memset_nocache_branch, PPC_INST_NOP);
+ patch_instruction_site(&patch__memcpy_nocache, ppc_inst(PPC_RAW_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));
@@ -116,7 +100,7 @@ notrace void __init machine_init(u64 dt_ptr)
}
/* Checks "l2cr=xxxx" command-line option */
-int __init ppc_setup_l2cr(char *str)
+static int __init ppc_setup_l2cr(char *str)
{
if (cpu_has_feature(CPU_FTR_L2CR)) {
unsigned long val = simple_strtoul(str, NULL, 0);
@@ -129,7 +113,7 @@ int __init ppc_setup_l2cr(char *str)
__setup("l2cr=", ppc_setup_l2cr);
/* Checks "l3cr=xxxx" command-line option */
-int __init ppc_setup_l3cr(char *str)
+static int __init ppc_setup_l3cr(char *str)
{
if (cpu_has_feature(CPU_FTR_L3CR)) {
unsigned long val = simple_strtoul(str, NULL, 0);
@@ -140,42 +124,7 @@ int __init ppc_setup_l3cr(char *str)
}
__setup("l3cr=", ppc_setup_l3cr);
-#ifdef CONFIG_GENERIC_NVRAM
-
-/* Generic nvram hooks used by drivers/char/gen_nvram.c */
-unsigned char nvram_read_byte(int addr)
-{
- if (ppc_md.nvram_read_val)
- return ppc_md.nvram_read_val(addr);
- return 0xff;
-}
-EXPORT_SYMBOL(nvram_read_byte);
-
-void nvram_write_byte(unsigned char val, int addr)
-{
- if (ppc_md.nvram_write_val)
- ppc_md.nvram_write_val(addr, val);
-}
-EXPORT_SYMBOL(nvram_write_byte);
-
-ssize_t nvram_get_size(void)
-{
- if (ppc_md.nvram_size)
- return ppc_md.nvram_size();
- return -1;
-}
-EXPORT_SYMBOL(nvram_get_size);
-
-void nvram_sync(void)
-{
- if (ppc_md.nvram_sync)
- ppc_md.nvram_sync();
-}
-EXPORT_SYMBOL(nvram_sync);
-
-#endif /* CONFIG_NVRAM */
-
-int __init ppc_init(void)
+static int __init ppc_init(void)
{
/* clear the progress line */
if (ppc_md.progress)
@@ -187,24 +136,41 @@ int __init ppc_init(void)
}
return 0;
}
-
arch_initcall(ppc_init);
+static void *__init alloc_stack(void)
+{
+ return memblock_alloc_or_panic(THREAD_SIZE, THREAD_ALIGN);
+}
+
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] = (struct thread_info *)
- __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
- hardirq_ctx[i] = (struct thread_info *)
- __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
+ softirq_ctx[i] = alloc_stack();
+ hardirq_ctx[i] = alloc_stack();
}
}
-#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
+#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
+
+#ifdef CONFIG_BOOKE
void __init exc_lvl_early_init(void)
{
unsigned int i, hw_cpu;
@@ -218,13 +184,10 @@ void __init exc_lvl_early_init(void)
hw_cpu = 0;
#endif
- critirq_ctx[hw_cpu] = (struct thread_info *)
- __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
+ critirq_ctx[hw_cpu] = alloc_stack();
#ifdef CONFIG_BOOKE
- dbgirq_ctx[hw_cpu] = (struct thread_info *)
- __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
- mcheckirq_ctx[hw_cpu] = (struct thread_info *)
- __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
+ dbgirq_ctx[hw_cpu] = alloc_stack();
+ mcheckirq_ctx[hw_cpu] = alloc_stack();
#endif
}
}
@@ -232,13 +195,13 @@ void __init exc_lvl_early_init(void)
void __init setup_power_save(void)
{
-#ifdef CONFIG_6xx
+#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
+#ifdef CONFIG_PPC_E500
if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
cpu_has_feature(CPU_FTR_CAN_NAP))
ppc_md.power_save = e500_idle;
@@ -254,7 +217,4 @@ __init void initialize_cache_info(void)
*/
dcache_bsize = cur_cpu_spec->dcache_bsize;
icache_bsize = cur_cpu_spec->icache_bsize;
- ucache_bsize = 0;
- if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
- ucache_bsize = icache_bsize = dcache_bsize;
}
generated by cgit (git 2.34.1) at 2025-12-25 08:50:27 +0000