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Diffstat (limited to 'arch/arm/include/asm/domain.h')
| -rw-r--r-- | arch/arm/include/asm/domain.h | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/arch/arm/include/asm/domain.h b/arch/arm/include/asm/domain.h new file mode 100644 index 000000000..41536feb4 --- /dev/null +++ b/arch/arm/include/asm/domain.h @@ -0,0 +1,141 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * arch/arm/include/asm/domain.h + * + * Copyright (C) 1999 Russell King. + */ +#ifndef __ASM_PROC_DOMAIN_H +#define __ASM_PROC_DOMAIN_H + +#ifndef __ASSEMBLY__ +#include <asm/barrier.h> +#include <asm/thread_info.h> +#endif + +/* + * Domain numbers + * + * DOMAIN_IO - domain 2 includes all IO only + * DOMAIN_USER - domain 1 includes all user memory only + * DOMAIN_KERNEL - domain 0 includes all kernel memory only + * + * The domain numbering depends on whether we support 36 physical + * address for I/O or not. Addresses above the 32 bit boundary can + * only be mapped using supersections and supersections can only + * be set for domain 0. We could just default to DOMAIN_IO as zero, + * but there may be systems with supersection support and no 36-bit + * addressing. In such cases, we want to map system memory with + * supersections to reduce TLB misses and footprint. + * + * 36-bit addressing and supersections are only available on + * CPUs based on ARMv6+ or the Intel XSC3 core. + */ +#ifndef CONFIG_IO_36 +#define DOMAIN_KERNEL 0 +#define DOMAIN_USER 1 +#define DOMAIN_IO 2 +#else +#define DOMAIN_KERNEL 2 +#define DOMAIN_USER 1 +#define DOMAIN_IO 0 +#endif +#define DOMAIN_VECTORS 3 + +/* + * Domain types + */ +#define DOMAIN_NOACCESS 0 +#define DOMAIN_CLIENT 1 +#ifdef CONFIG_CPU_USE_DOMAINS +#define DOMAIN_MANAGER 3 +#else +#define DOMAIN_MANAGER 1 +#endif + +#define domain_mask(dom) ((3) << (2 * (dom))) +#define domain_val(dom,type) ((type) << (2 * (dom))) + +#ifdef CONFIG_CPU_SW_DOMAIN_PAN +#define DACR_INIT \ + (domain_val(DOMAIN_USER, DOMAIN_NOACCESS) | \ + domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \ + domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \ + domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT)) +#else +#define DACR_INIT \ + (domain_val(DOMAIN_USER, DOMAIN_CLIENT) | \ + domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \ + domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \ + domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT)) +#endif + +#define __DACR_DEFAULT \ + domain_val(DOMAIN_KERNEL, DOMAIN_CLIENT) | \ + domain_val(DOMAIN_IO, DOMAIN_CLIENT) | \ + domain_val(DOMAIN_VECTORS, DOMAIN_CLIENT) + +#define DACR_UACCESS_DISABLE \ + (__DACR_DEFAULT | domain_val(DOMAIN_USER, DOMAIN_NOACCESS)) +#define DACR_UACCESS_ENABLE \ + (__DACR_DEFAULT | domain_val(DOMAIN_USER, DOMAIN_CLIENT)) + +#ifndef __ASSEMBLY__ + +#ifdef CONFIG_CPU_CP15_MMU +static __always_inline unsigned int get_domain(void) +{ + unsigned int domain; + + asm( + "mrc p15, 0, %0, c3, c0 @ get domain" + : "=r" (domain) + : "m" (current_thread_info()->cpu_domain)); + + return domain; +} + +static __always_inline void set_domain(unsigned int val) +{ + asm volatile( + "mcr p15, 0, %0, c3, c0 @ set domain" + : : "r" (val) : "memory"); + isb(); +} +#else +static __always_inline unsigned int get_domain(void) +{ + return 0; +} + +static __always_inline void set_domain(unsigned int val) +{ +} +#endif + +/* + * Generate the T (user) versions of the LDR/STR and related + * instructions (inline assembly) + */ +#ifdef CONFIG_CPU_USE_DOMAINS +#define TUSER(instr) TUSERCOND(instr, ) +#define TUSERCOND(instr, cond) #instr "t" #cond +#else +#define TUSER(instr) TUSERCOND(instr, ) +#define TUSERCOND(instr, cond) #instr #cond +#endif + +#else /* __ASSEMBLY__ */ + +/* + * Generate the T (user) versions of the LDR/STR and related + * instructions + */ +#ifdef CONFIG_CPU_USE_DOMAINS +#define TUSER(instr) instr ## t +#else +#define TUSER(instr) instr +#endif + +#endif /* __ASSEMBLY__ */ + +#endif /* !__ASM_PROC_DOMAIN_H */ |