diff options
Diffstat (limited to 'arch/i386/kernel/cpu/nexgen.c')
-rw-r--r-- | arch/i386/kernel/cpu/nexgen.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/arch/i386/kernel/cpu/nexgen.c b/arch/i386/kernel/cpu/nexgen.c new file mode 100644 index 0000000..30898a2 --- /dev/null +++ b/arch/i386/kernel/cpu/nexgen.c @@ -0,0 +1,63 @@ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/string.h> +#include <asm/processor.h> + +#include "cpu.h" + +/* + * Detect a NexGen CPU running without BIOS hypercode new enough + * to have CPUID. (Thanks to Herbert Oppmann) + */ + +static int __init deep_magic_nexgen_probe(void) +{ + int ret; + + __asm__ __volatile__ ( + " movw $0x5555, %%ax\n" + " xorw %%dx,%%dx\n" + " movw $2, %%cx\n" + " divw %%cx\n" + " movl $0, %%eax\n" + " jnz 1f\n" + " movl $1, %%eax\n" + "1:\n" + : "=a" (ret) : : "cx", "dx" ); + return ret; +} + +static void __init init_nexgen(struct cpuinfo_x86 * c) +{ + c->x86_cache_size = 256; /* A few had 1 MB... */ +} + +static void __init nexgen_identify(struct cpuinfo_x86 * c) +{ + /* Detect NexGen with old hypercode */ + if ( deep_magic_nexgen_probe() ) { + strcpy(c->x86_vendor_id, "NexGenDriven"); + } + generic_identify(c); +} + +static struct cpu_dev nexgen_cpu_dev __initdata = { + .c_vendor = "Nexgen", + .c_ident = { "NexGenDriven" }, + .c_models = { + { .vendor = X86_VENDOR_NEXGEN, + .family = 5, + .model_names = { [1] = "Nx586" } + }, + }, + .c_init = init_nexgen, + .c_identify = nexgen_identify, +}; + +int __init nexgen_init_cpu(void) +{ + cpu_devs[X86_VENDOR_NEXGEN] = &nexgen_cpu_dev; + return 0; +} + +//early_arch_initcall(nexgen_init_cpu); |