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authorKyongHo Cho <pullip.cho@samsung.com>2011-03-06 19:10:24 -0500
committerKukjin Kim <kgene.kim@samsung.com>2011-03-15 08:37:38 -0400
commitb0b6ff0b21057bb8e58b0be8b427a4713fd4b5a5 (patch)
tree911aa86fbe18c818d619304c2e8e458ccd739936 /include/linux/flex_array.h
parentb34f003f271d477f61a980d280afc77929047440 (diff)
ARM: EXYNOS4: Implement Clock gating for System MMU
This patch includes the implementation of the clock gating for System MMU. Initially, all System MMUs are not asserted the system clock. Asserting the system clock to a System MMU is enabled only when s5p_sysmmu_enable() is called. Likewise, it is disabled only when s5p_sysmmu_disable() is called. Therefore, clock gating on System MMUs are still invisible to the outside of the System MMU driver. Signed-off-by: KyongHo Cho <pullip.cho@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Diffstat (limited to 'include/linux/flex_array.h')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.2 (git 2.25.0) at 2026-06-16 04:53:31 -0400
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/*
 * Handling of different ABIs (personalities).
 *
 * We group personalities into execution domains which have their
 * own handlers for kernel entry points, signal mapping, etc...
 *
 * 2001-05-06	Complete rewrite,  Christoph Hellwig (hch@infradead.org)
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/kmod.h>
#include <linux/module.h>
#include <linux/personality.h>
#include <linux/proc_fs.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/syscalls.h>
#include <linux/sysctl.h>
#include <linux/types.h>


static void default_handler(int, struct pt_regs *);

static struct exec_domain *exec_domains = &default_exec_domain;
static DEFINE_RWLOCK(exec_domains_lock);


static u_long ident_map[32] = {
	0,	1,	2,	3,	4,	5,	6,	7,
	8,	9,	10,	11,	12,	13,	14,	15,
	16,	17,	18,	19,	20,	21,	22,	23,
	24,	25,	26,	27,	28,	29,	30,	31
};

struct exec_domain default_exec_domain = {
	.name		= "Linux",		/* name */
	.handler	= default_handler,	/* lcall7 causes a seg fault. */
	.pers_low	= 0, 			/* PER_LINUX personality. */
	.pers_high	= 0,			/* PER_LINUX personality. */
	.signal_map	= ident_map,		/* Identity map signals. */
	.signal_invmap	= ident_map,		/*  - both ways. */
};


static void
default_handler(int segment, struct pt_regs *regp)
{
	set_personality(0);

	if (current_thread_info()->exec_domain->handler != default_handler)
		current_thread_info()->exec_domain->handler(segment, regp);
	else
		send_sig(SIGSEGV, current, 1);
}

static struct exec_domain *
lookup_exec_domain(u_long personality)
{
	struct exec_domain *	ep;
	u_long			pers = personality(personality);

	read_lock(&exec_domains_lock);
	for (ep = exec_domains; ep; ep = ep->next) {
		if (pers >= ep->pers_low && pers <= ep->pers_high)
			if (try_module_get(ep->module))
				goto out;
	}

#ifdef CONFIG_MODULES
	read_unlock(&exec_domains_lock);
	request_module("personality-%ld", pers);
	read_lock(&exec_domains_lock);

	for (ep = exec_domains; ep; ep = ep->next) {
		if (pers >= ep->pers_low && pers <= ep->pers_high)
			if (try_module_get(ep->module))
				goto out;
	}
#endif

	ep = &default_exec_domain;
out:
	read_unlock(&exec_domains_lock);
	return (ep);
}

int
register_exec_domain(struct exec_domain *ep)
{
	struct exec_domain	*tmp;
	int			err = -EBUSY;

	if (ep == NULL)
		return -EINVAL;

	if (ep->next != NULL)
		return -EBUSY;

	write_lock(&exec_domains_lock);
	for (tmp = exec_domains; tmp; tmp = tmp->next) {
		if (tmp == ep)
			goto out;
	}

	ep->next = exec_domains;
	exec_domains = ep;
	err = 0;

out:
	write_unlock(&exec_domains_lock);
	return (err);
}

int
unregister_exec_domain(struct exec_domain *ep)
{
	struct exec_domain	**epp;

	epp = &exec_domains;
	write_lock(&exec_domains_lock);
	for (epp = &exec_domains; *epp; epp = &(*epp)->next) {
		if (ep == *epp)
			goto unregister;
	}
	write_unlock(&exec_domains_lock);
	return -EINVAL;

unregister:
	*epp = ep->next;
	ep->next = NULL;
	write_unlock(&exec_domains_lock);
	return 0;
}

int
__set_personality(u_long personality)
{
	struct exec_domain	*ep, *oep;

	ep = lookup_exec_domain(personality);
	if (ep == current_thread_info()->exec_domain) {
		current->personality = personality;
		module_put(ep->module);
		return 0;
	}

	if (atomic_read(&current->fs->count) != 1) {
		struct fs_struct *fsp, *ofsp;

		fsp = copy_fs_struct(current->fs);
		if (fsp == NULL) {
			module_put(ep->module);
			return -ENOMEM;
		}

		task_lock(current);
		ofsp = current->fs;
		current->fs = fsp;
		task_unlock(current);

		put_fs_struct(ofsp);
	}

	/*
	 * At that point we are guaranteed to be the sole owner of
	 * current->fs.
	 */

	current->personality = personality;
	oep = current_thread_info()->exec_domain;
	current_thread_info()->exec_domain = ep;

	module_put(oep->module);
	return 0;
}

#ifdef CONFIG_PROC_FS
static int execdomains_proc_show(struct seq_file *m, void *v)
{
	struct exec_domain	*ep;

	read_lock(&exec_domains_lock);
	for (ep = exec_domains; ep; ep = ep->next)
		seq_printf(m, "%d-%d\t%-16s\t[%s]\n",
			       ep->pers_low, ep->pers_high, ep->name,
			       module_name(ep->module));
	read_unlock(&exec_domains_lock);
	return 0;
}

static int execdomains_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, execdomains_proc_show, NULL);
}

static const struct file_operations execdomains_proc_fops = {
	.open		= execdomains_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int __init proc_execdomains_init(void)
{
	proc_create("execdomains", 0, NULL, &execdomains_proc_fops);
	return 0;
}
module_init(proc_execdomains_init);
#endif

asmlinkage long
sys_personality(u_long personality)
{
	u_long old = current->personality;

	if (personality != 0xffffffff) {
		set_personality(personality);
		if (current->personality != personality)
			return -EINVAL;
	}

	return (long)old;
}


EXPORT_SYMBOL(register_exec_domain);
EXPORT_SYMBOL(unregister_exec_domain);
EXPORT_SYMBOL(__set_personality);
generated by cgit v1.2.2 (git 2.25.0) at 2026-06-16 04:53:31 -0400