diff options
| author | Helge Deller <deller@gmx.de> | 2017-08-10 19:20:47 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2017-08-22 16:34:34 +0200 |
| commit | 1ed4714fba25a3730369567b081549ee1da49124 (patch) | |
| tree | 064fe86a142c514565588d31675d991e4460d97e /arch/parisc/kernel | |
| parent | d2883fa1a6fcb065362f27f410114dc6b7084655 (diff) | |
parisc/random: Add machine specific randomness
Add some machine-specific information like values of cr16 cycle counter,
machine-specific software ID and machine model to the random generator.
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc/kernel')
| -rw-r--r-- | arch/parisc/kernel/processor.c | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/arch/parisc/kernel/processor.c b/arch/parisc/kernel/processor.c index 0ab32779dfa7..6b6fe8d62893 100644 --- a/arch/parisc/kernel/processor.c +++ b/arch/parisc/kernel/processor.c @@ -30,6 +30,7 @@ #include <linux/mm.h> #include <linux/module.h> #include <linux/seq_file.h> +#include <linux/random.h> #include <linux/slab.h> #include <linux/cpu.h> #include <asm/param.h> @@ -237,28 +238,45 @@ static int processor_probe(struct parisc_device *dev) */ void __init collect_boot_cpu_data(void) { + unsigned long cr16_seed; + memset(&boot_cpu_data, 0, sizeof(boot_cpu_data)); + cr16_seed = get_cycles(); + add_device_randomness(&cr16_seed, sizeof(cr16_seed)); + boot_cpu_data.cpu_hz = 100 * PAGE0->mem_10msec; /* Hz of this PARISC */ /* get CPU-Model Information... */ #define p ((unsigned long *)&boot_cpu_data.pdc.model) - if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK) + if (pdc_model_info(&boot_cpu_data.pdc.model) == PDC_OK) { printk(KERN_INFO "model %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n", p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8]); + + add_device_randomness(&boot_cpu_data.pdc.model, + sizeof(boot_cpu_data.pdc.model)); + } #undef p - if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK) + if (pdc_model_versions(&boot_cpu_data.pdc.versions, 0) == PDC_OK) { printk(KERN_INFO "vers %08lx\n", boot_cpu_data.pdc.versions); - if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK) + add_device_randomness(&boot_cpu_data.pdc.versions, + sizeof(boot_cpu_data.pdc.versions)); + } + + if (pdc_model_cpuid(&boot_cpu_data.pdc.cpuid) == PDC_OK) { printk(KERN_INFO "CPUID vers %ld rev %ld (0x%08lx)\n", (boot_cpu_data.pdc.cpuid >> 5) & 127, boot_cpu_data.pdc.cpuid & 31, boot_cpu_data.pdc.cpuid); + add_device_randomness(&boot_cpu_data.pdc.cpuid, + sizeof(boot_cpu_data.pdc.cpuid)); + } + if (pdc_model_capabilities(&boot_cpu_data.pdc.capabilities) == PDC_OK) printk(KERN_INFO "capabilities 0x%lx\n", boot_cpu_data.pdc.capabilities); |