diff options
Diffstat (limited to 'arch/i386/kernel/bootflag.c')
-rw-r--r-- | arch/i386/kernel/bootflag.c | 98 |
1 files changed, 0 insertions, 98 deletions
diff --git a/arch/i386/kernel/bootflag.c b/arch/i386/kernel/bootflag.c deleted file mode 100644 index 0b9860530a6..00000000000 --- a/arch/i386/kernel/bootflag.c +++ /dev/null @@ -1,98 +0,0 @@ -/* - * Implement 'Simple Boot Flag Specification 2.0' - */ - - -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/string.h> -#include <linux/slab.h> -#include <linux/spinlock.h> -#include <linux/acpi.h> -#include <asm/io.h> - -#include <linux/mc146818rtc.h> - - -#define SBF_RESERVED (0x78) -#define SBF_PNPOS (1<<0) -#define SBF_BOOTING (1<<1) -#define SBF_DIAG (1<<2) -#define SBF_PARITY (1<<7) - - -int sbf_port __initdata = -1; /* set via acpi_boot_init() */ - - -static int __init parity(u8 v) -{ - int x = 0; - int i; - - for(i=0;i<8;i++) - { - x^=(v&1); - v>>=1; - } - return x; -} - -static void __init sbf_write(u8 v) -{ - unsigned long flags; - if(sbf_port != -1) - { - v &= ~SBF_PARITY; - if(!parity(v)) - v|=SBF_PARITY; - - printk(KERN_INFO "Simple Boot Flag at 0x%x set to 0x%x\n", sbf_port, v); - - spin_lock_irqsave(&rtc_lock, flags); - CMOS_WRITE(v, sbf_port); - spin_unlock_irqrestore(&rtc_lock, flags); - } -} - -static u8 __init sbf_read(void) -{ - u8 v; - unsigned long flags; - if(sbf_port == -1) - return 0; - spin_lock_irqsave(&rtc_lock, flags); - v = CMOS_READ(sbf_port); - spin_unlock_irqrestore(&rtc_lock, flags); - return v; -} - -static int __init sbf_value_valid(u8 v) -{ - if(v&SBF_RESERVED) /* Reserved bits */ - return 0; - if(!parity(v)) - return 0; - return 1; -} - -static int __init sbf_init(void) -{ - u8 v; - if(sbf_port == -1) - return 0; - v = sbf_read(); - if(!sbf_value_valid(v)) - printk(KERN_WARNING "Simple Boot Flag value 0x%x read from CMOS RAM was invalid\n",v); - - v &= ~SBF_RESERVED; - v &= ~SBF_BOOTING; - v &= ~SBF_DIAG; -#if defined(CONFIG_ISAPNP) - v |= SBF_PNPOS; -#endif - sbf_write(v); - return 0; -} - -module_init(sbf_init); |