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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/power/acpi/os_specific/service_layers/osunixmap.c | |
parent | Initial commit. (diff) | |
download | linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/power/acpi/os_specific/service_layers/osunixmap.c')
-rw-r--r-- | tools/power/acpi/os_specific/service_layers/osunixmap.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/tools/power/acpi/os_specific/service_layers/osunixmap.c b/tools/power/acpi/os_specific/service_layers/osunixmap.c new file mode 100644 index 000000000..c565546e8 --- /dev/null +++ b/tools/power/acpi/os_specific/service_layers/osunixmap.c @@ -0,0 +1,117 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/****************************************************************************** + * + * Module Name: osunixmap - Unix OSL for file mappings + * + * Copyright (C) 2000 - 2020, Intel Corp. + * + *****************************************************************************/ + +#include "acpidump.h" +#include <unistd.h> +#include <sys/mman.h> +#ifdef _free_BSD +#include <sys/param.h> +#endif + +#define _COMPONENT ACPI_OS_SERVICES +ACPI_MODULE_NAME("osunixmap") + +#ifndef O_BINARY +#define O_BINARY 0 +#endif +#if defined(_dragon_fly) || defined(_free_BSD) || defined(_QNX) +#define MMAP_FLAGS MAP_SHARED +#else +#define MMAP_FLAGS MAP_PRIVATE +#endif +#define SYSTEM_MEMORY "/dev/mem" +/******************************************************************************* + * + * FUNCTION: acpi_os_get_page_size + * + * PARAMETERS: None + * + * RETURN: Page size of the platform. + * + * DESCRIPTION: Obtain page size of the platform. + * + ******************************************************************************/ +static acpi_size acpi_os_get_page_size(void) +{ + +#ifdef PAGE_SIZE + return PAGE_SIZE; +#else + return sysconf(_SC_PAGESIZE); +#endif +} + +/****************************************************************************** + * + * FUNCTION: acpi_os_map_memory + * + * PARAMETERS: where - Physical address of memory to be mapped + * length - How much memory to map + * + * RETURN: Pointer to mapped memory. Null on error. + * + * DESCRIPTION: Map physical memory into local address space. + * + *****************************************************************************/ + +void *acpi_os_map_memory(acpi_physical_address where, acpi_size length) +{ + u8 *mapped_memory; + acpi_physical_address offset; + acpi_size page_size; + int fd; + + fd = open(SYSTEM_MEMORY, O_RDONLY | O_BINARY); + if (fd < 0) { + fprintf(stderr, "Cannot open %s\n", SYSTEM_MEMORY); + return (NULL); + } + + /* Align the offset to use mmap */ + + page_size = acpi_os_get_page_size(); + offset = where % page_size; + + /* Map the table header to get the length of the full table */ + + mapped_memory = mmap(NULL, (length + offset), PROT_READ, MMAP_FLAGS, + fd, (where - offset)); + if (mapped_memory == MAP_FAILED) { + fprintf(stderr, "Cannot map %s\n", SYSTEM_MEMORY); + close(fd); + return (NULL); + } + + close(fd); + return (ACPI_CAST8(mapped_memory + offset)); +} + +/****************************************************************************** + * + * FUNCTION: acpi_os_unmap_memory + * + * PARAMETERS: where - Logical address of memory to be unmapped + * length - How much memory to unmap + * + * RETURN: None. + * + * DESCRIPTION: Delete a previously created mapping. Where and Length must + * correspond to a previous mapping exactly. + * + *****************************************************************************/ + +void acpi_os_unmap_memory(void *where, acpi_size length) +{ + acpi_physical_address offset; + acpi_size page_size; + + page_size = acpi_os_get_page_size(); + offset = ACPI_TO_INTEGER(where) % page_size; + munmap((u8 *)where - offset, (length + offset)); +} |