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git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - arch/powerpc/kernel/setup_32.c
2 * Common prep/pmac/chrp boot and setup code.
5 #include <linux/module.h>
6 #include <linux/string.h>
7 #include <linux/sched.h>
8 #include <linux/init.h>
9 #include <linux/kernel.h>
10 #include <linux/reboot.h>
11 #include <linux/delay.h>
12 #include <linux/initrd.h>
13 #include <linux/tty.h>
14 #include <linux/seq_file.h>
15 #include <linux/root_dev.h>
16 #include <linux/cpu.h>
17 #include <linux/console.h>
18 #include <linux/memblock.h>
19 #include <linux/export.h>
20 #include <linux/nvram.h>
24 #include <asm/processor.h>
25 #include <asm/pgtable.h>
26 #include <asm/setup.h>
29 #include <asm/cputable.h>
30 #include <asm/bootx.h>
31 #include <asm/btext.h>
32 #include <asm/machdep.h>
33 #include <linux/uaccess.h>
34 #include <asm/pmac_feature.h>
35 #include <asm/sections.h>
36 #include <asm/nvram.h>
39 #include <asm/serial.h>
41 #include <asm/code-patching.h>
42 #include <asm/cpu_has_feature.h>
43 #include <asm/asm-prototypes.h>
44 #include <asm/kdump.h>
45 #include <asm/feature-fixups.h>
51 extern void bootx_init(unsigned long r4
, unsigned long phys
);
54 EXPORT_SYMBOL_GPL(boot_cpuid_phys
);
56 int smp_hw_index
[NR_CPUS
];
57 EXPORT_SYMBOL(smp_hw_index
);
59 unsigned long ISA_DMA_THRESHOLD
;
60 unsigned int DMA_MODE_READ
;
61 unsigned int DMA_MODE_WRITE
;
63 EXPORT_SYMBOL(DMA_MODE_READ
);
64 EXPORT_SYMBOL(DMA_MODE_WRITE
);
67 * We're called here very early in the boot.
69 * Note that the kernel may be running at an address which is different
70 * from the address that it was linked at, so we must use RELOC/PTRRELOC
71 * to access static data (including strings). -- paulus
73 notrace
unsigned long __init
early_init(unsigned long dt_ptr
)
75 unsigned long offset
= reloc_offset();
77 /* First zero the BSS -- use memset_io, some platforms don't have
79 memset_io((void __iomem
*)PTRRELOC(&__bss_start
), 0,
80 __bss_stop
- __bss_start
);
83 * Identify the CPU type and fix up code sections
84 * that depend on which cpu we have.
86 identify_cpu(offset
, mfspr(SPRN_PVR
));
88 apply_feature_fixups();
90 return KERNELBASE
+ offset
;
95 * This is run before start_kernel(), the kernel has been relocated
96 * and we are running with enough of the MMU enabled to have our
97 * proper kernel virtual addresses
99 * We do the initial parsing of the flat device-tree and prepares
100 * for the MMU to be fully initialized.
102 notrace
void __init
machine_init(u64 dt_ptr
)
104 unsigned int *addr
= (unsigned int *)patch_site_addr(&patch__memset_nocache
);
107 /* Configure static keys first, now that we're relocated. */
108 setup_feature_keys();
110 /* Enable early debugging if any specified (see udbg.h) */
113 patch_instruction_site(&patch__memcpy_nocache
, PPC_INST_NOP
);
115 insn
= create_cond_branch(addr
, branch_target(addr
), 0x820000);
116 patch_instruction(addr
, insn
); /* replace b by bne cr0 */
118 /* Do some early initialization based on the flat device tree */
119 early_init_devtree(__va(dt_ptr
));
123 setup_kdump_trampoline();
126 /* Checks "l2cr=xxxx" command-line option */
127 static int __init
ppc_setup_l2cr(char *str
)
129 if (cpu_has_feature(CPU_FTR_L2CR
)) {
130 unsigned long val
= simple_strtoul(str
, NULL
, 0);
131 printk(KERN_INFO
"l2cr set to %lx\n", val
);
132 _set_L2CR(0); /* force invalidate by disable cache */
133 _set_L2CR(val
); /* and enable it */
137 __setup("l2cr=", ppc_setup_l2cr
);
139 /* Checks "l3cr=xxxx" command-line option */
140 static int __init
ppc_setup_l3cr(char *str
)
142 if (cpu_has_feature(CPU_FTR_L3CR
)) {
143 unsigned long val
= simple_strtoul(str
, NULL
, 0);
144 printk(KERN_INFO
"l3cr set to %lx\n", val
);
145 _set_L3CR(val
); /* and enable it */
149 __setup("l3cr=", ppc_setup_l3cr
);
151 static int __init
ppc_init(void)
153 /* clear the progress line */
155 ppc_md
.progress(" ", 0xffff);
157 /* call platform init */
158 if (ppc_md
.init
!= NULL
) {
163 arch_initcall(ppc_init
);
165 static void *__init
alloc_stack(void)
167 void *ptr
= memblock_alloc(THREAD_SIZE
, THREAD_SIZE
);
170 panic("cannot allocate %d bytes for stack at %pS\n",
171 THREAD_SIZE
, (void *)_RET_IP_
);
176 void __init
irqstack_early_init(void)
180 /* interrupt stacks must be in lowmem, we get that for free on ppc32
181 * as the memblock is limited to lowmem by default */
182 for_each_possible_cpu(i
) {
183 softirq_ctx
[i
] = alloc_stack();
184 hardirq_ctx
[i
] = alloc_stack();
188 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
189 void __init
exc_lvl_early_init(void)
191 unsigned int i
, hw_cpu
;
193 /* interrupt stacks must be in lowmem, we get that for free on ppc32
194 * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */
195 for_each_possible_cpu(i
) {
197 hw_cpu
= get_hard_smp_processor_id(i
);
202 critirq_ctx
[hw_cpu
] = alloc_stack();
204 dbgirq_ctx
[hw_cpu
] = alloc_stack();
205 mcheckirq_ctx
[hw_cpu
] = alloc_stack();
211 void __init
setup_power_save(void)
213 #ifdef CONFIG_PPC_BOOK3S_32
214 if (cpu_has_feature(CPU_FTR_CAN_DOZE
) ||
215 cpu_has_feature(CPU_FTR_CAN_NAP
))
216 ppc_md
.power_save
= ppc6xx_idle
;
220 if (cpu_has_feature(CPU_FTR_CAN_DOZE
) ||
221 cpu_has_feature(CPU_FTR_CAN_NAP
))
222 ppc_md
.power_save
= e500_idle
;
226 __init
void initialize_cache_info(void)
229 * Set cache line size based on type of cpu as a default.
230 * Systems with OF can look in the properties on the cpu node(s)
231 * for a possibly more accurate value.
233 dcache_bsize
= cur_cpu_spec
->dcache_bsize
;
234 icache_bsize
= cur_cpu_spec
->icache_bsize
;
236 if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE
))
237 ucache_bsize
= icache_bsize
= dcache_bsize
;