Release 4.10 arch/x86/kernel/cpu/microcode/core.c

/*
 * CPU Microcode Update Driver for Linux
 *
 * Copyright (C) 2000-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
 *            2006      Shaohua Li <shaohua.li@intel.com>
 *            2013-2016 Borislav Petkov <bp@alien8.de>
 *
 * X86 CPU microcode early update for Linux:
 *
 *      Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com>
 *                         H Peter Anvin" <hpa@zytor.com>
 *                (C) 2015 Borislav Petkov <bp@alien8.de>
 *
 * This driver allows to upgrade microcode on x86 processors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */


#define pr_fmt(fmt) "microcode: " fmt

#include <linux/platform_device.h>
#include <linux/syscore_ops.h>
#include <linux/miscdevice.h>
#include <linux/capability.h>
#include <linux/firmware.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/cpu.h>
#include <linux/fs.h>
#include <linux/mm.h>

#include <asm/microcode_intel.h>
#include <asm/cpu_device_id.h>
#include <asm/microcode_amd.h>
#include <asm/perf_event.h>
#include <asm/microcode.h>
#include <asm/processor.h>
#include <asm/cmdline.h>
#include <asm/setup.h>


#define DRIVER_VERSION	"2.2"


static struct microcode_ops	*microcode_ops;

static bool dis_ucode_ldr = true;


bool initrd_gone;


LIST_HEAD(microcode_cache);

/*
 * Synchronization.
 *
 * All non cpu-hotplug-callback call sites use:
 *
 * - microcode_mutex to synchronize with each other;
 * - get/put_online_cpus() to synchronize with
 *   the cpu-hotplug-callback call sites.
 *
 * We guarantee that only a single cpu is being
 * updated at any particular moment of time.
 */
static DEFINE_MUTEX(microcode_mutex);


struct ucode_cpu_info		ucode_cpu_info[NR_CPUS];

/*
 * Operations that are run on a target cpu:
 */


struct cpu_info_ctx {
	
struct cpu_signature	*cpu_sig;
	
int			err;
};



static bool __init check_loader_disabled_bsp(void)
{
	static const char *__dis_opt_str = "dis_ucode_ldr";
	u32 a, b, c, d;

#ifdef CONFIG_X86_32
	const char *cmdline = (const char *)__pa_nodebug(boot_command_line);
	const char *option  = (const char *)__pa_nodebug(__dis_opt_str);
	bool *res = (bool *)__pa_nodebug(&dis_ucode_ldr);

#else /* CONFIG_X86_64 */
	const char *cmdline = boot_command_line;
	const char *option  = __dis_opt_str;
	bool *res = &dis_ucode_ldr;
#endif

	if (!have_cpuid_p())
		return *res;

	a = 1;
	c = 0;
	native_cpuid(&a, &b, &c, &d);

	/*
         * CPUID(1).ECX[31]: reserved for hypervisor use. This is still not
         * completely accurate as xen pv guests don't see that CPUID bit set but
         * that's good enough as they don't land on the BSP path anyway.
         */
	if (c & BIT(31))
		return *res;

	if (cmdline_find_option_bool(cmdline, option) <= 0)
		*res = false;

	return *res;
}

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extern struct builtin_fw __start_builtin_fw[];
extern struct builtin_fw __end_builtin_fw[];



bool get_builtin_firmware(struct cpio_data *cd, const char *name)
{
#ifdef CONFIG_FW_LOADER
	struct builtin_fw *b_fw;

	for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++) {
		if (!strcmp(name, b_fw->name)) {
			cd->size = b_fw->size;
			cd->data = b_fw->data;
			return true;
		}
	}
#endif
	return false;
}

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void __init load_ucode_bsp(void)
{
	int vendor;
	unsigned int family;

	if (check_loader_disabled_bsp())
		return;

	vendor = x86_cpuid_vendor();
	family = x86_cpuid_family();

	switch (vendor) {
	case X86_VENDOR_INTEL:
		if (family >= 6)
			load_ucode_intel_bsp();
		break;
	case X86_VENDOR_AMD:
		if (family >= 0x10)
			load_ucode_amd_bsp(family);
		break;
	default:
		break;
	}
}

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static bool check_loader_disabled_ap(void)
{
#ifdef CONFIG_X86_32
	return *((bool *)__pa_nodebug(&dis_ucode_ldr));
#else
	return dis_ucode_ldr;
#endif
}

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void load_ucode_ap(void)
{
	int vendor, family;

	if (check_loader_disabled_ap())
		return;

	vendor = x86_cpuid_vendor();
	family = x86_cpuid_family();

	switch (vendor) {
	case X86_VENDOR_INTEL:
		if (family >= 6)
			load_ucode_intel_ap();
		break;
	case X86_VENDOR_AMD:
		if (family >= 0x10)
			load_ucode_amd_ap(family);
		break;
	default:
		break;
	}
}

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static int __init save_microcode_in_initrd(void)
{
	struct cpuinfo_x86 *c = &boot_cpu_data;
	int ret = -EINVAL;

	switch (c->x86_vendor) {
	case X86_VENDOR_INTEL:
		if (c->x86 >= 6)
			ret = save_microcode_in_initrd_intel();
		break;
	case X86_VENDOR_AMD:
		if (c->x86 >= 0x10)
			ret = save_microcode_in_initrd_amd(c->x86);
		break;
	default:
		break;
	}

	initrd_gone = true;

	return ret;
}

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struct cpio_data find_microcode_in_initrd(const char *path, bool use_pa)
{
#ifdef CONFIG_BLK_DEV_INITRD
	unsigned long start = 0;
	size_t size;

#ifdef CONFIG_X86_32
	struct boot_params *params;

	if (use_pa)
		params = (struct boot_params *)__pa_nodebug(&boot_params);
	else
		params = &boot_params;

	size = params->hdr.ramdisk_size;

	/*
         * Set start only if we have an initrd image. We cannot use initrd_start
         * because it is not set that early yet.
         */
	if (size)
		start = params->hdr.ramdisk_image;

# else /* CONFIG_X86_64 */
	size  = (unsigned long)boot_params.ext_ramdisk_size << 32;
	size |= boot_params.hdr.ramdisk_size;

	if (size) {
		start  = (unsigned long)boot_params.ext_ramdisk_image << 32;
		start |= boot_params.hdr.ramdisk_image;

		start += PAGE_OFFSET;
	}
# endif

	/*
         * Fixup the start address: after reserve_initrd() runs, initrd_start
         * has the virtual address of the beginning of the initrd. It also
         * possibly relocates the ramdisk. In either case, initrd_start contains
         * the updated address so use that instead.
         *
         * initrd_gone is for the hotplug case where we've thrown out initrd
         * already.
         */
	if (!use_pa) {
		if (initrd_gone)
			return (struct cpio_data){ NULL, 0, "" };
		if (initrd_start)
			start = initrd_start;
	}

	return find_cpio_data(path, (void *)start, size, NULL);
#else /* !CONFIG_BLK_DEV_INITRD */
	return (struct cpio_data){ NULL, 0, "" };
#endif
}

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void reload_early_microcode(void)
{
	int vendor, family;

	vendor = x86_cpuid_vendor();
	family = x86_cpuid_family();

	switch (vendor) {
	case X86_VENDOR_INTEL:
		if (family >= 6)
			reload_ucode_intel();
		break;
	case X86_VENDOR_AMD:
		if (family >= 0x10)
			reload_ucode_amd();
		break;
	default:
		break;
	}
}

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static void collect_cpu_info_local(void *arg)
{
	struct cpu_info_ctx *ctx = arg;

	ctx->err = microcode_ops->collect_cpu_info(smp_processor_id(),
						   ctx->cpu_sig);
}

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static int collect_cpu_info_on_target(int cpu, struct cpu_signature *cpu_sig)
{
	struct cpu_info_ctx ctx = { .cpu_sig = cpu_sig, .err = 0 };
	int ret;

	ret = smp_call_function_single(cpu, collect_cpu_info_local, &ctx, 1);
	if (!ret)
		ret = ctx.err;

	return ret;
}

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static int collect_cpu_info(int cpu)
{
	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
	int ret;

	memset(uci, 0, sizeof(*uci));

	ret = collect_cpu_info_on_target(cpu, &uci->cpu_sig);
	if (!ret)
		uci->valid = 1;

	return ret;
}

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struct apply_microcode_ctx {
	
int err;
};



static void apply_microcode_local(void *arg)
{
	struct apply_microcode_ctx *ctx = arg;

	ctx->err = microcode_ops->apply_microcode(smp_processor_id());
}

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static int apply_microcode_on_target(int cpu)
{
	struct apply_microcode_ctx ctx = { .err = 0 };
	int ret;

	ret = smp_call_function_single(cpu, apply_microcode_local, &ctx, 1);
	if (!ret)
		ret = ctx.err;

	return ret;
}

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#ifdef CONFIG_MICROCODE_OLD_INTERFACE


static int do_microcode_update(const void __user *buf, size_t size)
{
	int error = 0;
	int cpu;

	for_each_online_cpu(cpu) {
		struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
		enum ucode_state ustate;

		if (!uci->valid)
			continue;

		ustate = microcode_ops->request_microcode_user(cpu, buf, size);
		if (ustate == UCODE_ERROR) {
			error = -1;
			break;
		} else if (ustate == UCODE_OK)
			apply_microcode_on_target(cpu);
	}

	return error;
}

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static int microcode_open(struct inode *inode, struct file *file)
{
	return capable(CAP_SYS_RAWIO) ? nonseekable_open(inode, file) : -EPERM;
}

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static ssize_t microcode_write(struct file *file, const char __user *buf,
			       size_t len, loff_t *ppos)
{
	ssize_t ret = -EINVAL;

	if ((len >> PAGE_SHIFT) > totalram_pages) {
		pr_err("too much data (max %ld pages)\n", totalram_pages);
		return ret;
	}

	get_online_cpus();
	mutex_lock(&microcode_mutex);

	if (do_microcode_update(buf, len) == 0)
		ret = (ssize_t)len;

	if (ret > 0)
		perf_check_microcode();

	mutex_unlock(&microcode_mutex);
	put_online_cpus();

	return ret;
}

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static const struct file_operations microcode_fops = {
	.owner			= THIS_MODULE,
	.write			= microcode_write,
	.open			= microcode_open,
	.llseek		= no_llseek,
};


static struct miscdevice microcode_dev = {
	.minor			= MICROCODE_MINOR,
	.name			= "microcode",
	.nodename		= "cpu/microcode",
	.fops			= &microcode_fops,
};



static int __init microcode_dev_init(void)
{
	int error;

	error = misc_register(&microcode_dev);
	if (error) {
		pr_err("can't misc_register on minor=%d\n", MICROCODE_MINOR);
		return error;
	}

	return 0;
}

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static void __exit microcode_dev_exit(void)
{
	misc_deregister(&microcode_dev);
}
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#else

#define microcode_dev_init()	0

#define microcode_dev_exit()	do { } while (0)
#endif

/* fake device for request_firmware */

static struct platform_device	*microcode_pdev;



static int reload_for_cpu(int cpu)
{
	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
	enum ucode_state ustate;
	int err = 0;

	if (!uci->valid)
		return err;

	ustate = microcode_ops->request_microcode_fw(cpu, &microcode_pdev->dev, true);
	if (ustate == UCODE_OK)
		apply_microcode_on_target(cpu);
	else
		if (ustate == UCODE_ERROR)
			err = -EINVAL;
	return err;
}

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static ssize_t reload_store(struct device *dev,
			    struct device_attribute *attr,
			    const char *buf, size_t size)
{
	unsigned long val;
	int cpu;
	ssize_t ret = 0, tmp_ret;

	ret = kstrtoul(buf, 0, &val);
	if (ret)
		return ret;

	if (val != 1)
		return size;

	get_online_cpus();
	mutex_lock(&microcode_mutex);
	for_each_online_cpu(cpu) {
		tmp_ret = reload_for_cpu(cpu);
		if (tmp_ret != 0)
			pr_warn("Error reloading microcode on CPU %d\n", cpu);

		/* save retval of the first encountered reload error */
		if (!ret)
			ret = tmp_ret;
	}
	if (!ret)
		perf_check_microcode();
	mutex_unlock(&microcode_mutex);
	put_online_cpus();

	if (!ret)
		ret = size;

	return ret;
}

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static ssize_t version_show(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;

	return sprintf(buf, "0x%x\n", uci->cpu_sig.rev);
}

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static ssize_t pf_show(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;

	return sprintf(buf, "0x%x\n", uci->cpu_sig.pf);
}

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static DEVICE_ATTR(reload, 0200, NULL, reload_store);
static DEVICE_ATTR(version, 0400, version_show, NULL);
static DEVICE_ATTR(processor_flags, 0400, pf_show, NULL);


static struct attribute *mc_default_attrs[] = {
	&dev_attr_version.attr,
	&dev_attr_processor_flags.attr,
	NULL
};


static struct attribute_group mc_attr_group = {
	.attrs			= mc_default_attrs,
	.name			= "microcode",
};



static void microcode_fini_cpu(int cpu)
{
	if (microcode_ops->microcode_fini_cpu)
		microcode_ops->microcode_fini_cpu(cpu);
}

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static enum ucode_state microcode_resume_cpu(int cpu)
{
	if (apply_microcode_on_target(cpu))
		return UCODE_ERROR;

	pr_debug("CPU%d updated upon resume\n", cpu);

	return UCODE_OK;
}

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static enum ucode_state microcode_init_cpu(int cpu, bool refresh_fw)
{
	enum ucode_state ustate;
	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;

	if (uci->valid)
		return UCODE_OK;

	if (collect_cpu_info(cpu))
		return UCODE_ERROR;

	/* --dimm. Trigger a delayed update? */
	if (system_state != SYSTEM_RUNNING)
		return UCODE_NFOUND;

	ustate = microcode_ops->request_microcode_fw(cpu, &microcode_pdev->dev,
						     refresh_fw);

	if (ustate == UCODE_OK) {
		pr_debug("CPU%d updated upon init\n", cpu);
		apply_microcode_on_target(cpu);
	}

	return ustate;
}

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static enum ucode_state microcode_update_cpu(int cpu)
{
	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;

	/* Refresh CPU microcode revision after resume. */
	collect_cpu_info(cpu);

	if (uci->valid)
		return microcode_resume_cpu(cpu);

	return microcode_init_cpu(cpu, false);
}

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42.86%
rusty russell
rusty russell
1
2.22%
1
14.29%
Total
45
100.00%
7
100.00%



static int mc_device_add(struct device *dev, struct subsys_interface *sif)
{
	int err, cpu = dev->id;

	if (!cpu_online(cpu))
		return 0;

	pr_debug("CPU%d added\n", cpu);

	err = sysfs_create_group(&dev->kobj, &mc_attr_group);
	if (err)
		return err;

	if (microcode_init_cpu(cpu, true) == UCODE_ERROR)
		return -EINVAL;

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
peter oruba
peter oruba
58
71.60%
1
14.29%
kay sievers
kay sievers
10
12.35%
1
14.29%
dmitry adamushko
dmitry adamushko
7
8.64%
1
14.29%
borislav petkov
borislav petkov
4
4.94%
2
28.57%
rusty russell
rusty russell
1
1.23%
1
14.29%
joe perches
joe perches
1
1.23%
1
14.29%
Total
81
100.00%
7
100.00%



static void mc_device_remove(struct device *dev, struct subsys_interface *sif)
{
	int cpu = dev->id;

	if (!cpu_online(cpu))
		return;

	pr_debug("CPU%d removed\n", cpu);
	microcode_fini_cpu(cpu);
	sysfs_remove_group(&dev->kobj, &mc_attr_group);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
peter oruba
peter oruba
43
78.18%
1
25.00%
kay sievers
kay sievers
9
16.36%
1
25.00%
viresh kumar
viresh kumar
2
3.64%
1
25.00%
joe perches
joe perches
1
1.82%
1
25.00%
Total
55
100.00%
4
100.00%


static struct subsys_interface mc_cpu_interface = {
	.name			= "microcode",
	.subsys			= &cpu_subsys,
	.add_dev		= mc_device_add,
	.remove_dev		= mc_device_remove,
};

/**
 * mc_bp_resume - Update boot CPU microcode during resume.
 */


static void mc_bp_resume(void)
{
	int cpu = smp_processor_id();
	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;

	if (uci->valid && uci->mc)
		microcode_ops->apply_microcode(cpu);
	else if (!uci->mc)
		reload_early_microcode();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
dmitry adamushko
dmitry adamushko
22
43.14%
1
20.00%
peter oruba
peter oruba
13
25.49%
1
20.00%
borislav petkov
borislav petkov
11
21.57%
2
40.00%
rafael j. wysocki
rafael j. wysocki
5
9.80%
1
20.00%
Total
51
100.00%
5
100.00%


static struct syscore_ops mc_syscore_ops = {
	.resume			= mc_bp_resume,
};



static int mc_cpu_online(unsigned int cpu)
{
	struct device *dev;

	dev = get_cpu_device(cpu);
	microcode_update_cpu(cpu);
	pr_debug("CPU%d added\n", cpu);

	if (sysfs_create_group(&dev->kobj, &mc_attr_group))
		pr_err("Failed to create group for CPU%d\n", cpu);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
peter oruba
peter oruba
36
63.16%
1
14.29%
sebastian andrzej siewior
sebastian andrzej siewior
7
12.28%
1
14.29%
kay sievers
kay sievers
5
8.77%
1
14.29%
dmitry adamushko
dmitry adamushko
4
7.02%
2
28.57%
rusty russell
rusty russell
3
5.26%
1
14.29%
joe perches
joe perches
2
3.51%
1
14.29%
Total
57
100.00%
7
100.00%



static int mc_cpu_down_prep(unsigned int cpu)
{
	struct device *dev;

	dev = get_cpu_device(cpu);
	/* Suspend is in progress, only remove the interface */
	sysfs_remove_group(&dev->kobj, &mc_attr_group);
	pr_debug("CPU%d removed\n", cpu);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sebastian andrzej siewior
sebastian andrzej siewior
22
50.00%
1
20.00%
peter oruba
peter oruba
14
31.82%
1
20.00%
dmitry adamushko
dmitry adamushko
6
13.64%
1
20.00%
kay sievers
kay sievers
1
2.27%
1
20.00%
joe perches
joe perches
1
2.27%
1
20.00%
Total
44
100.00%
5
100.00%


static struct attribute *cpu_root_microcode_attrs[] = {
	&dev_attr_reload.attr,
	NULL
};


static struct attribute_group cpu_root_microcode_group = {
	.name  = "microcode",
	.attrs = cpu_root_microcode_attrs,
};



int __init microcode_init(void)
{
	struct cpuinfo_x86 *c = &boot_cpu_data;
	int error;

	if (dis_ucode_ldr)
		return -EINVAL;

	if (c->x86_vendor == X86_VENDOR_INTEL)
		microcode_ops = init_intel_microcode();
	else if (c->x86_vendor == X86_VENDOR_AMD)
		microcode_ops = init_amd_microcode();
	else
		pr_err("no support for this CPU vendor\n");

	if (!microcode_ops)
		return -ENODEV;

	microcode_pdev = platform_device_register_simple("microcode", -1,
							 NULL, 0);
	if (IS_ERR(microcode_pdev))
		return PTR_ERR(microcode_pdev);

	get_online_cpus();
	mutex_lock(&microcode_mutex);

	error = subsys_interface_register(&mc_cpu_interface);
	if (!error)
		perf_check_microcode();
	mutex_unlock(&microcode_mutex);
	put_online_cpus();

	if (error)
		goto out_pdev;

	error = sysfs_create_group(&cpu_subsys.dev_root->kobj,
				   &cpu_root_microcode_group);

	if (error) {
		pr_err("Error creating microcode group!\n");
		goto out_driver;
	}

	error = microcode_dev_init();
	if (error)
		goto out_ucode_group;

	register_syscore_ops(&mc_syscore_ops);
	cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "x86/microcode:online",
				  mc_cpu_online, mc_cpu_down_prep);

	pr_info("Microcode Update Driver: v%s.", DRIVER_VERSION);

	return 0;

 out_ucode_group:
	sysfs_remove_group(&cpu_subsys.dev_root->kobj,
			   &cpu_root_microcode_group);

 out_driver:
	get_online_cpus();
	mutex_lock(&microcode_mutex);

	subsys_interface_unregister(&mc_cpu_interface);

	mutex_unlock(&microcode_mutex);
	put_online_cpus();

 out_pdev:
	platform_device_unregister(microcode_pdev);
	return error;

}
Contributors
Person
Tokens
Prop
Commits
CommitProp
peter oruba
peter oruba
75
29.30%
3
15.79%
borislav petkov
borislav petkov
55
21.48%
5
26.32%
dmitry adamushko
dmitry adamushko
52
20.31%
2
10.53%
srivatsa s. bhat
srivatsa s. bhat
38
14.84%
1
5.26%
sebastian andrzej siewior
sebastian andrzej siewior
8
3.12%
1
5.26%
peter zijlstra
peter zijlstra
8
3.12%
1
5.26%
rafael j. wysocki
rafael j. wysocki
6
2.34%
1
5.26%
andreas herrmann
andreas herrmann
6
2.34%
1
5.26%
greg kroah-hartman
greg kroah-hartman
3
1.17%
1
5.26%
kay sievers
kay sievers
2
0.78%
1
5.26%
boris ostrovsky
boris ostrovsky
2
0.78%
1
5.26%
joe perches
joe perches
1
0.39%
1
5.26%
Total
256
100.00%
19
100.00%


fs_initcall(save_microcode_in_initrd);

late_initcall(microcode_init);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
borislav petkov
borislav petkov
980
36.75%
26
44.07%
peter oruba
peter oruba
752
28.20%
4
6.78%
dmitry adamushko
dmitry adamushko
587
22.01%
6
10.17%
kay sievers
kay sievers
60
2.25%
3
5.08%
rusty russell
rusty russell
53
1.99%
1
1.69%
srivatsa s. bhat
srivatsa s. bhat
39
1.46%
1
1.69%
sebastian andrzej siewior
sebastian andrzej siewior
37
1.39%
1
1.69%
peter zijlstra
peter zijlstra
30
1.12%
1
1.69%
rafael j. wysocki
rafael j. wysocki
28
1.05%
1
1.69%
fenghua yu
fenghua yu
18
0.67%
1
1.69%
joe perches
joe perches
15
0.56%
1
1.69%
arnd bergmann
arnd bergmann
13
0.49%
2
3.39%
hugh dickins
hugh dickins
12
0.45%
1
1.69%
stephane eranian
stephane eranian
9
0.34%
1
1.69%
shuah khan
shuah khan
8
0.30%
1
1.69%
ingo molnar
ingo molnar
7
0.26%
1
1.69%
andreas herrmann
andreas herrmann
6
0.22%
1
1.69%
greg kroah-hartman
greg kroah-hartman
3
0.11%
1
1.69%
hannes eder
hannes eder
2
0.07%
1
1.69%
boris ostrovsky
boris ostrovsky
2
0.07%
1
1.69%
andi kleen
andi kleen
2
0.07%
1
1.69%
viresh kumar
viresh kumar
2
0.07%
1
1.69%
jan beulich
jan beulich
2
0.07%
1
1.69%
Total
2667
100.00%
59
100.00%
Directory: arch/x86/kernel/cpu/microcode

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