In preparation for adding device tree support, this patch consolidates all of the atag-specific setup into a single function.
v5: - drop double printk("Machine; %s\n", ...); call. - leave copying boot_command_line in setup_arch() since it isn't atags specific. v4: - adapt to the removal of lookup_machine_type() - break out dump of machine_desc table into dump_machine_table() because the device tree probe code will use it. - Add for_each_machine_desc() macro
Tested-by: Tony Lindgren tony@atomide.com Signed-off-by: Grant Likely grant.likely@secretlab.ca --- arch/arm/include/asm/mach/arch.h | 7 ++++ arch/arm/kernel/setup.c | 69 ++++++++++++++++++++++---------------- 2 files changed, 47 insertions(+), 29 deletions(-)
diff --git a/arch/arm/include/asm/mach/arch.h b/arch/arm/include/asm/mach/arch.h index bf13b81..4764e67 100644 --- a/arch/arm/include/asm/mach/arch.h +++ b/arch/arm/include/asm/mach/arch.h @@ -48,6 +48,13 @@ struct machine_desc { extern struct machine_desc *machine_desc;
/* + * Machine type table - also only accessible during boot + */ +extern struct machine_desc __arch_info_begin[], __arch_info_end[]; +#define for_each_machine_desc(p) \ + for (p = __arch_info_begin; p < __arch_info_end; p++) + +/* * Set of macros to define architecture features. This is built into * a table by the linker. */ diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index 109997e..42c2f0c 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -439,25 +439,12 @@ void cpu_init(void) : "r14"); }
-static struct machine_desc * __init setup_machine(unsigned int nr) +static void __init dump_machine_table(void) { - extern struct machine_desc __arch_info_begin[], __arch_info_end[]; struct machine_desc *p;
- /* - * locate machine in the list of supported machines. - */ - for (p = __arch_info_begin; p < __arch_info_end; p++) - if (nr == p->nr) { - printk("Machine: %s\n", p->name); - return p; - } - - early_print("\n" - "Error: unrecognized/unsupported machine ID (r1 = 0x%08x).\n\n" - "Available machine support:\n\nID (hex)\tNAME\n", nr); - - for (p = __arch_info_begin; p < __arch_info_end; p++) + early_print("Available machine support:\n\nID (hex)\tNAME\n"); + for_each_machine_desc(p) early_print("%08x\t%s\n", p->nr, p->name);
early_print("\nPlease check your kernel config and/or bootloader.\n"); @@ -796,23 +783,29 @@ static void __init squash_mem_tags(struct tag *tag) tag->hdr.tag = ATAG_NONE; }
-void __init setup_arch(char **cmdline_p) +static struct machine_desc * __init setup_machine_tags(unsigned int nr) { struct tag *tags = (struct tag *)&init_tags; - struct machine_desc *mdesc; + struct machine_desc *mdesc = NULL, *p; char *from = default_command_line;
init_tags.mem.start = PHYS_OFFSET;
- unwind_init(); - - setup_processor(); - mdesc = setup_machine(machine_arch_type); - machine_desc = mdesc; - machine_name = mdesc->name; + /* + * locate machine in the list of supported machines. + */ + for_each_machine_desc(p) + if (nr == p->nr) { + printk("Machine: %s\n", p->name); + mdesc = p; + break; + }
- if (mdesc->soft_reboot) - reboot_setup("s"); + if (!mdesc) { + early_print("\nError: unrecognized/unsupported machine ID" + " (r1 = 0x%08x).\n\n", nr); + dump_machine_table(); /* does not return */ + }
if (__atags_pointer) tags = phys_to_virt(__atags_pointer); @@ -857,14 +850,32 @@ void __init setup_arch(char **cmdline_p) parse_tags(tags); }
+ /* parse_early_param needs a boot_command_line */ + strlcpy(boot_command_line, from, COMMAND_LINE_SIZE); + + return mdesc; +} + + +void __init setup_arch(char **cmdline_p) +{ + struct machine_desc *mdesc; + + unwind_init(); + + setup_processor(); + mdesc = setup_machine_tags(machine_arch_type); + machine_desc = mdesc; + machine_name = mdesc->name; + + if (mdesc->soft_reboot) + reboot_setup("s"); + init_mm.start_code = (unsigned long) _text; init_mm.end_code = (unsigned long) _etext; init_mm.end_data = (unsigned long) _edata; init_mm.brk = (unsigned long) _end;
- /* parse_early_param needs a boot_command_line */ - strlcpy(boot_command_line, from, COMMAND_LINE_SIZE); - /* populate cmd_line too for later use, preserving boot_command_line */ strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE); *cmdline_p = cmd_line;