diff options
Diffstat (limited to 'arch/powerpc/include/asm/nohash/pte-e500.h')
| -rw-r--r-- | arch/powerpc/include/asm/nohash/pte-e500.h | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/nohash/pte-e500.h b/arch/powerpc/include/asm/nohash/pte-e500.h new file mode 100644 index 000000000000..0934e8965e4e --- /dev/null +++ b/arch/powerpc/include/asm/nohash/pte-e500.h @@ -0,0 +1,129 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_POWERPC_NOHASH_PTE_E500_H +#define _ASM_POWERPC_NOHASH_PTE_E500_H +#ifdef __KERNEL__ + +/* PTE bit definitions for processors compliant to the Book3E + * architecture 2.06 or later. The position of the PTE bits + * matches the HW definition of the optional Embedded Page Table + * category. + */ + +/* Architected bits */ +#define _PAGE_PRESENT 0x000001 /* software: pte contains a translation */ +#define _PAGE_SW1 0x000002 +#define _PAGE_BIT_SWAP_TYPE 2 +#define _PAGE_BAP_SR 0x000004 +#define _PAGE_BAP_UR 0x000008 +#define _PAGE_BAP_SW 0x000010 +#define _PAGE_BAP_UW 0x000020 +#define _PAGE_BAP_SX 0x000040 +#define _PAGE_BAP_UX 0x000080 +#define _PAGE_PSIZE_MSK 0x000f00 +#define _PAGE_PSIZE_4K 0x000200 +#define _PAGE_PSIZE_8K 0x000300 +#define _PAGE_PSIZE_16K 0x000400 +#define _PAGE_PSIZE_32K 0x000500 +#define _PAGE_PSIZE_64K 0x000600 +#define _PAGE_PSIZE_128K 0x000700 +#define _PAGE_PSIZE_256K 0x000800 +#define _PAGE_PSIZE_512K 0x000900 +#define _PAGE_PSIZE_1M 0x000a00 +#define _PAGE_PSIZE_2M 0x000b00 +#define _PAGE_PSIZE_4M 0x000c00 +#define _PAGE_PSIZE_8M 0x000d00 +#define _PAGE_PSIZE_16M 0x000e00 +#define _PAGE_PSIZE_32M 0x000f00 +#define _PAGE_DIRTY 0x001000 /* C: page changed */ +#define _PAGE_SW0 0x002000 +#define _PAGE_U3 0x004000 +#define _PAGE_U2 0x008000 +#define _PAGE_U1 0x010000 +#define _PAGE_U0 0x020000 +#define _PAGE_ACCESSED 0x040000 +#define _PAGE_ENDIAN 0x080000 +#define _PAGE_GUARDED 0x100000 +#define _PAGE_COHERENT 0x200000 /* M: enforce memory coherence */ +#define _PAGE_NO_CACHE 0x400000 /* I: cache inhibit */ +#define _PAGE_WRITETHRU 0x800000 /* W: cache write-through */ + +/* "Higher level" linux bit combinations */ +#define _PAGE_EXEC (_PAGE_BAP_SX | _PAGE_BAP_UX) /* .. and was cache cleaned */ +#define _PAGE_RW (_PAGE_BAP_SW | _PAGE_BAP_UW) /* User write permission */ +#define _PAGE_KERNEL_RW (_PAGE_BAP_SW | _PAGE_BAP_SR | _PAGE_DIRTY) +#define _PAGE_KERNEL_RO (_PAGE_BAP_SR) +#define _PAGE_KERNEL_RWX (_PAGE_BAP_SW | _PAGE_BAP_SR | _PAGE_DIRTY | _PAGE_BAP_SX) +#define _PAGE_KERNEL_ROX (_PAGE_BAP_SR | _PAGE_BAP_SX) +#define _PAGE_USER (_PAGE_BAP_UR | _PAGE_BAP_SR) /* Can be read */ +#define _PAGE_PRIVILEGED (_PAGE_BAP_SR) + +#define _PAGE_SPECIAL _PAGE_SW0 + +/* Base page size */ +#define _PAGE_PSIZE _PAGE_PSIZE_4K +#define PTE_RPN_SHIFT (24) + +#define PTE_WIMGE_SHIFT (19) +#define PTE_BAP_SHIFT (2) + +/* On 32-bit, we never clear the top part of the PTE */ +#ifdef CONFIG_PPC32 +#define _PTE_NONE_MASK 0xffffffff00000000ULL +#define _PMD_PRESENT 0 +#define _PMD_PRESENT_MASK (PAGE_MASK) +#define _PMD_BAD (~PAGE_MASK) +#define _PMD_USER 0 +#else +#define _PTE_NONE_MASK 0 +#endif + +/* + * We define 2 sets of base prot bits, one for basic pages (ie, + * cacheable kernel and user pages) and one for non cacheable + * pages. We always set _PAGE_COHERENT when SMP is enabled or + * the processor might need it for DMA coherency. + */ +#define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE) +#if defined(CONFIG_SMP) +#define _PAGE_BASE (_PAGE_BASE_NC | _PAGE_COHERENT) +#else +#define _PAGE_BASE (_PAGE_BASE_NC) +#endif + +/* Permission masks used to generate the __P and __S table */ +#define PAGE_NONE __pgprot(_PAGE_BASE) +#define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW) +#define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | _PAGE_BAP_UX) +#define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER) +#define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_BAP_UX) +#define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER) +#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_BAP_UX) + +#ifndef __ASSEMBLY__ +static inline pte_t pte_mkprivileged(pte_t pte) +{ + return __pte((pte_val(pte) & ~_PAGE_USER) | _PAGE_PRIVILEGED); +} + +#define pte_mkprivileged pte_mkprivileged + +static inline pte_t pte_mkuser(pte_t pte) +{ + return __pte((pte_val(pte) & ~_PAGE_PRIVILEGED) | _PAGE_USER); +} + +#define pte_mkuser pte_mkuser + +static inline pte_t pte_mkexec(pte_t pte) +{ + if (pte_val(pte) & _PAGE_BAP_UR) + return __pte((pte_val(pte) & ~_PAGE_BAP_SX) | _PAGE_BAP_UX); + else + return __pte((pte_val(pte) & ~_PAGE_BAP_UX) | _PAGE_BAP_SX); +} +#define pte_mkexec pte_mkexec + +#endif /* __ASSEMBLY__ */ + +#endif /* __KERNEL__ */ +#endif /* _ASM_POWERPC_NOHASH_PTE_E500_H */ |