tools/testing/selftests/mm/pkey-powerpc.h

Source file repositories/reference/linux-study-clean/tools/testing/selftests/mm/pkey-powerpc.h

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/mm/pkey-powerpc.h
Extension
.h
Size
4005 bytes
Lines
146
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _PKEYS_POWERPC_H
#define _PKEYS_POWERPC_H

#include <sys/stat.h>

#ifndef SYS_pkey_alloc
# define SYS_pkey_alloc		384
# define SYS_pkey_free		385
#endif
#define REG_IP_IDX		PT_NIP
#define MCONTEXT_IP(mc)		mc.gp_regs[REG_IP_IDX]
#define MCONTEXT_TRAPNO(mc)	mc.gp_regs[REG_TRAPNO]
#define REG_TRAPNO		PT_TRAP
#define MCONTEXT_FPREGS
#define gregs			gp_regs
#define fpregs			fp_regs
#define si_pkey_offset		0x20

#undef PKEY_DISABLE_ACCESS
#define PKEY_DISABLE_ACCESS	0x3  /* disable read and write */

#undef PKEY_DISABLE_WRITE
#define PKEY_DISABLE_WRITE	0x2

#define NR_PKEYS		32
#define NR_RESERVED_PKEYS_4K	27 /* pkey-0, pkey-1, exec-only-pkey
				      and 24 other keys that cannot be
				      represented in the PTE */
#define NR_RESERVED_PKEYS_64K_3KEYS	3 /* PowerNV and KVM: pkey-0,
					     pkey-1 and exec-only key */
#define NR_RESERVED_PKEYS_64K_4KEYS	4 /* PowerVM: pkey-0, pkey-1,
					     pkey-31 and exec-only key */
#define PKEY_BITS_PER_PKEY	2
#define HPAGE_SIZE		(1UL << 24)
#define PAGE_SIZE		sysconf(_SC_PAGESIZE)

static inline u32 pkey_bit_position(int pkey)
{
	return (NR_PKEYS - pkey - 1) * PKEY_BITS_PER_PKEY;
}

static inline u64 __read_pkey_reg(void)
{
	u64 pkey_reg;

	asm volatile("mfspr %0, 0xd" : "=r" (pkey_reg));

	return pkey_reg;
}

static inline void __write_pkey_reg(u64 pkey_reg)
{
	u64 amr = pkey_reg;

	dprintf4("%s() changing %016llx to %016llx\n",
			 __func__, __read_pkey_reg(), pkey_reg);

	asm volatile("isync; mtspr 0xd, %0; isync"
		     : : "r" ((unsigned long)(amr)) : "memory");

	dprintf4("%s() pkey register after changing %016llx to %016llx\n",
			__func__, __read_pkey_reg(), pkey_reg);
}

static inline int cpu_has_pkeys(void)
{
	/* No simple way to determine this */
	return 1;
}

static inline bool arch_is_powervm()
{
	struct stat buf;

	if ((stat("/sys/firmware/devicetree/base/ibm,partition-name", &buf) == 0) &&
	    (stat("/sys/firmware/devicetree/base/hmc-managed?", &buf) == 0) &&
	    (stat("/sys/firmware/devicetree/base/chosen/qemu,graphic-width", &buf) == -1) )
		return true;

	return false;
}

static inline int get_arch_reserved_keys(void)
{
	if (sysconf(_SC_PAGESIZE) == 4096)
		return NR_RESERVED_PKEYS_4K;
	else
		if (arch_is_powervm())
			return NR_RESERVED_PKEYS_64K_4KEYS;
		else

Annotation

Implementation Notes