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/ide.h>
14 #include <linux/tty.h>
15 #include <linux/bootmem.h>
16 #include <linux/seq_file.h>
17 #include <linux/root_dev.h>
18 #include <linux/cpu.h>
19 #include <linux/console.h>
21 #include <asm/residual.h>
24 #include <asm/processor.h>
25 #include <asm/pgtable.h>
26 #include <asm/setup.h>
27 #include <asm/amigappc.h>
30 #include <asm/cputable.h>
31 #include <asm/bootx.h>
32 #include <asm/btext.h>
33 #include <asm/machdep.h>
34 #include <asm/uaccess.h>
35 #include <asm/system.h>
36 #include <asm/pmac_feature.h>
37 #include <asm/sections.h>
38 #include <asm/nvram.h>
41 #include <asm/serial.h>
48 #if defined CONFIG_KGDB
52 extern void bootx_init(unsigned long r4, unsigned long phys);
54 struct ide_machdep_calls ppc_ide_md;
57 EXPORT_SYMBOL_GPL(boot_cpuid);
60 unsigned long ISA_DMA_THRESHOLD;
61 unsigned int DMA_MODE_READ;
62 unsigned int DMA_MODE_WRITE;
66 #ifdef CONFIG_VGA_CONSOLE
67 unsigned long vgacon_remap_base;
71 * These are used in binfmt_elf.c to put aux entries on the stack
72 * for each elf executable being started.
79 * We're called here very early in the boot. We determine the machine
80 * type and call the appropriate low-level setup functions.
81 * -- Cort <cort@fsmlabs.com>
83 * Note that the kernel may be running at an address which is different
84 * from the address that it was linked at, so we must use RELOC/PTRRELOC
85 * to access static data (including strings). -- paulus
87 unsigned long __init early_init(unsigned long dt_ptr)
89 unsigned long offset = reloc_offset();
91 /* First zero the BSS -- use memset_io, some platforms don't have
93 memset_io((void __iomem *)PTRRELOC(&__bss_start), 0, _end - __bss_start);
96 * Identify the CPU type and fix up code sections
97 * that depend on which cpu we have.
99 identify_cpu(offset, 0);
100 do_cpu_ftr_fixups(offset);
102 return KERNELBASE + offset;
107 * Find out what kind of machine we're on and save any data we need
108 * from the early boot process (devtree is copied on pmac by prom_init()).
109 * This is called very early on the boot process, after a minimal
110 * MMU environment has been set up but before MMU_init is called.
112 void __init machine_init(unsigned long dt_ptr, unsigned long phys)
114 /* If btext is enabled, we might have a BAT setup for early display,
115 * thus we do enable some very basic udbg output
117 #ifdef CONFIG_BOOTX_TEXT
118 udbg_putc = btext_drawchar;
121 /* Do some early initialization based on the flat device tree */
122 early_init_devtree(__va(dt_ptr));
127 if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
128 cpu_has_feature(CPU_FTR_CAN_NAP))
129 ppc_md.power_save = ppc6xx_idle;
133 ppc_md.progress("id mach(): done", 0x200);
136 #ifdef CONFIG_BOOKE_WDT
137 /* Checks wdt=x and wdt_period=xx command-line option */
138 int __init early_parse_wdt(char *p)
140 if (p && strncmp(p, "0", 1) != 0)
141 booke_wdt_enabled = 1;
145 early_param("wdt", early_parse_wdt);
147 int __init early_parse_wdt_period (char *p)
150 booke_wdt_period = simple_strtoul(p, NULL, 0);
154 early_param("wdt_period", early_parse_wdt_period);
155 #endif /* CONFIG_BOOKE_WDT */
157 /* Checks "l2cr=xxxx" command-line option */
158 int __init ppc_setup_l2cr(char *str)
160 if (cpu_has_feature(CPU_FTR_L2CR)) {
161 unsigned long val = simple_strtoul(str, NULL, 0);
162 printk(KERN_INFO "l2cr set to %lx\n", val);
163 _set_L2CR(0); /* force invalidate by disable cache */
164 _set_L2CR(val); /* and enable it */
168 __setup("l2cr=", ppc_setup_l2cr);
170 #ifdef CONFIG_GENERIC_NVRAM
172 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
173 unsigned char nvram_read_byte(int addr)
175 if (ppc_md.nvram_read_val)
176 return ppc_md.nvram_read_val(addr);
179 EXPORT_SYMBOL(nvram_read_byte);
181 void nvram_write_byte(unsigned char val, int addr)
183 if (ppc_md.nvram_write_val)
184 ppc_md.nvram_write_val(addr, val);
186 EXPORT_SYMBOL(nvram_write_byte);
188 void nvram_sync(void)
190 if (ppc_md.nvram_sync)
193 EXPORT_SYMBOL(nvram_sync);
195 #endif /* CONFIG_NVRAM */
197 static struct cpu cpu_devices[NR_CPUS];
199 int __init ppc_init(void)
203 /* clear the progress line */
204 if ( ppc_md.progress ) ppc_md.progress(" ", 0xffff);
206 /* register CPU devices */
207 for_each_possible_cpu(i)
208 register_cpu(&cpu_devices[i], i);
210 /* call platform init */
211 if (ppc_md.init != NULL) {
217 arch_initcall(ppc_init);
219 /* Warning, IO base is not yet inited */
220 void __init setup_arch(char **cmdline_p)
222 *cmdline_p = cmd_line;
224 /* so udelay does something sensible, assume <= 1000 bogomips */
225 loops_per_jiffy = 500000000 / HZ;
227 unflatten_device_tree();
230 if (ppc_md.init_early)
233 find_legacy_serial_ports();
235 smp_setup_cpu_maps();
237 /* Register early console */
238 register_early_udbg_console();
242 #if defined(CONFIG_KGDB)
243 if (ppc_md.kgdb_map_scc)
244 ppc_md.kgdb_map_scc();
246 if (strstr(cmd_line, "gdb")) {
248 ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
249 printk("kgdb breakpoint activated\n");
255 * Set cache line size based on type of cpu as a default.
256 * Systems with OF can look in the properties on the cpu node(s)
257 * for a possibly more accurate value.
259 if (cpu_has_feature(CPU_FTR_SPLIT_ID_CACHE)) {
260 dcache_bsize = cur_cpu_spec->dcache_bsize;
261 icache_bsize = cur_cpu_spec->icache_bsize;
264 ucache_bsize = dcache_bsize = icache_bsize
265 = cur_cpu_spec->dcache_bsize;
267 /* reboot on panic */
273 init_mm.start_code = PAGE_OFFSET;
274 init_mm.end_code = (unsigned long) _etext;
275 init_mm.end_data = (unsigned long) _edata;
276 init_mm.brk = klimit;
278 /* set up the bootmem stuff with available memory */
280 if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);
282 #ifdef CONFIG_DUMMY_CONSOLE
283 conswitchp = &dummy_con;
287 if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);