ACPI Initialization

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1.Initialization
file:///C:/DOCUME%7E1/ADMINI%7E1/LOCALS%7E1/Temp/moz-screenshot-2.jpg

a) Reserve
low memory region for sleep support.( acpi_reserve_bootmem)
file:///C:/DOCUME%7E1/ADMINI%7E1/LOCALS%7E1/Temp/moz-screenshot-1.jpg

• I386: start_kernel(init/main.c)
  –> setup_arch -> setup_memory -> setup_bootmem_allocator(arch/x86/kernel/setup_32.c) -> acpi_reserve_bootmem

• x86_64: start_kernel –> setup_arch -> acpi_reserve_bootmem

/**
* acpi_reserve_bootmem - do _very_ early ACPI
initialization
*
* We allocate a page from the first 1MB of
memory for the wakeup
* routine for when we come back from a sleep
state. The
* runtime allocator allows specification of
*
*/
void __init acpi_reserve_bootmem(void)
{
       if
((&wakeup_end - &wakeup_start) > PAGE_SIZE*2) {
              printk(KERN_ERR
                     "ACPI: Wakeup code way too big, S3
disabled.\n");
              return;
       }

       acpi_wakeup_address
= (unsigned long)alloc_bootmem_low(PAGE_SIZE*2);
       if
(!acpi_wakeup_address)
              printk(KERN_ERR
"ACPI: Cannot allocate lowmem, S3 disabled.\n");
}

b) The
ACPI boot-time table parser. (acpi_boot_table_init)
c) Read
APIC and some other early information from ACPI tables. (acpi_boot_init)

start_kernel(init/main.c)->setup_arch(arch/x86/kernel/setup.c)->
acpi_boot_table_init, acpi_boot_init(x86/kernel/acpi/boot.c)

d) Early init before LAPIC and SMP init
                       
I.            
reallocate
ACPI tables. (acpi_reallocate_root_table)
                    
II.            
Initializes
all global variables (initialize_subsystem)
                  
III.            
load
the System Description Tables.( acpi_load_tables)
                  
IV.            
enable
ACPI. (acpi_enable_subsystem)

start_kernel(init/main.c)->acpi_early_init(drivers/acpi/bus.c)










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本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u1/52215/showart_655389.html