diff options
Diffstat (limited to 'qemu/roms/ipxe/src/include/ipxe/linux/linux_uaccess.h')
| -rw-r--r-- | qemu/roms/ipxe/src/include/ipxe/linux/linux_uaccess.h | 126 |
1 files changed, 59 insertions, 67 deletions
diff --git a/qemu/roms/ipxe/src/include/ipxe/linux/linux_uaccess.h b/qemu/roms/ipxe/src/include/ipxe/linux/linux_uaccess.h index e4d16d9e0..acd919a85 100644 --- a/qemu/roms/ipxe/src/include/ipxe/linux/linux_uaccess.h +++ b/qemu/roms/ipxe/src/include/ipxe/linux/linux_uaccess.h @@ -1,116 +1,108 @@ -/* - * Copyright (C) 2010 Piotr Jaroszyński <p.jaroszynski@gmail.com> - * - * 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 any later version. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. - */ - #ifndef _IPXE_LINUX_UACCESS_H #define _IPXE_LINUX_UACCESS_H -FILE_LICENCE(GPL2_OR_LATER); - /** @file * - * iPXE user access API for linux + * iPXE user access API for Linux + * + * We run with no distinction between internal and external addresses, + * so can use trivial_virt_to_user() et al. * - * In linux userspace virtual == user == phys addresses. - * Physical addresses also being the same is wrong, but there is no general way - * of converting userspace addresses to physical as what appears to be - * contiguous in userspace is physically fragmented. - * Currently only the DMA memory is special-cased, but its conversion to bus - * addresses is done in phys_to_bus. - * This is known to break virtio as it is passing phys addresses to the virtual - * device. + * We have no concept of the underlying physical addresses, since + * these are not exposed to userspace. We provide a stub + * implementation of user_to_phys() since this is required by + * alloc_memblock(). We provide no implementation of phys_to_user(); + * any code attempting to access physical addresses will therefore + * (correctly) fail to link. */ +FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); + #ifdef UACCESS_LINUX #define UACCESS_PREFIX_linux #else #define UACCESS_PREFIX_linux __linux_ #endif -static inline __always_inline userptr_t -UACCESS_INLINE(linux, phys_to_user)(unsigned long phys_addr) -{ - return phys_addr; -} - +/** + * Convert user buffer to physical address + * + * @v userptr User pointer + * @v offset Offset from user pointer + * @ret phys_addr Physical address + */ static inline __always_inline unsigned long -UACCESS_INLINE(linux, user_to_phys)(userptr_t userptr, off_t offset) -{ - return userptr + offset; +UACCESS_INLINE ( linux, user_to_phys ) ( userptr_t userptr, off_t offset ) { + + /* We do not know the real underlying physical address. We + * provide this stub implementation only because it is + * required by alloc_memblock() (which allocates memory with + * specified physical address alignment). We assume that the + * low-order bits of virtual addresses match the low-order + * bits of physical addresses, and so simply returning the + * virtual address will suffice for the purpose of determining + * alignment. + */ + return ( userptr + offset ); } static inline __always_inline userptr_t -UACCESS_INLINE(linux, virt_to_user)(volatile const void *addr) -{ - return trivial_virt_to_user(addr); +UACCESS_INLINE ( linux, virt_to_user ) ( volatile const void *addr ) { + return trivial_virt_to_user ( addr ); } static inline __always_inline void * -UACCESS_INLINE(linux, user_to_virt)(userptr_t userptr, off_t offset) -{ - return trivial_user_to_virt(userptr, offset); +UACCESS_INLINE ( linux, user_to_virt ) ( userptr_t userptr, off_t offset ) { + return trivial_user_to_virt ( userptr, offset ); } static inline __always_inline userptr_t -UACCESS_INLINE(linux, userptr_add)(userptr_t userptr, off_t offset) -{ - return trivial_userptr_add(userptr, offset); +UACCESS_INLINE ( linux, userptr_add ) ( userptr_t userptr, off_t offset ) { + return trivial_userptr_add ( userptr, offset ); } static inline __always_inline off_t -UACCESS_INLINE(linux, userptr_sub)(userptr_t userptr, userptr_t subtrahend) -{ +UACCESS_INLINE ( linux, userptr_sub ) ( userptr_t userptr, + userptr_t subtrahend ) { return trivial_userptr_sub ( userptr, subtrahend ); } static inline __always_inline void -UACCESS_INLINE(linux, memcpy_user)(userptr_t dest, off_t dest_off, userptr_t src, off_t src_off, size_t len) -{ - trivial_memcpy_user(dest, dest_off, src, src_off, len); +UACCESS_INLINE ( linux, memcpy_user ) ( userptr_t dest, off_t dest_off, + userptr_t src, off_t src_off, + size_t len ) { + trivial_memcpy_user ( dest, dest_off, src, src_off, len ); } static inline __always_inline void -UACCESS_INLINE(linux, memmove_user)(userptr_t dest, off_t dest_off, userptr_t src, off_t src_off, size_t len) -{ - trivial_memmove_user(dest, dest_off, src, src_off, len); +UACCESS_INLINE ( linux, memmove_user ) ( userptr_t dest, off_t dest_off, + userptr_t src, off_t src_off, + size_t len ) { + trivial_memmove_user ( dest, dest_off, src, src_off, len ); } static inline __always_inline int -UACCESS_INLINE(linux, memcmp_user)(userptr_t first, off_t first_off, userptr_t second, off_t second_off, size_t len) -{ - return trivial_memcmp_user(first, first_off, second, second_off, len); +UACCESS_INLINE ( linux, memcmp_user ) ( userptr_t first, off_t first_off, + userptr_t second, off_t second_off, + size_t len ) { + return trivial_memcmp_user ( first, first_off, second, second_off, len); } static inline __always_inline void -UACCESS_INLINE(linux, memset_user)(userptr_t buffer, off_t offset, int c, size_t len) -{ - trivial_memset_user(buffer, offset, c, len); +UACCESS_INLINE ( linux, memset_user ) ( userptr_t buffer, off_t offset, + int c, size_t len ) { + trivial_memset_user ( buffer, offset, c, len ); } static inline __always_inline size_t -UACCESS_INLINE(linux, strlen_user)(userptr_t buffer, off_t offset) -{ - return trivial_strlen_user(buffer, offset); +UACCESS_INLINE ( linux, strlen_user ) ( userptr_t buffer, off_t offset ) { + return trivial_strlen_user ( buffer, offset ); } static inline __always_inline off_t -UACCESS_INLINE(linux, memchr_user)(userptr_t buffer, off_t offset, int c, size_t len) -{ - return trivial_memchr_user(buffer, offset, c, len); +UACCESS_INLINE ( linux, memchr_user ) ( userptr_t buffer, off_t offset, + int c, size_t len ) { + return trivial_memchr_user ( buffer, offset, c, len ); } #endif /* _IPXE_LINUX_UACCESS_H */ |