141 lines
3.9 KiB
C
141 lines
3.9 KiB
C
/*
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* Copyright 2012 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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#include "priv.h"
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static int
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acpi_read_bios(acpi_handle rom_handle, u8 *bios, u32 offset, u32 length)
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{
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#if defined(CONFIG_ACPI) && defined(CONFIG_X86)
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acpi_status status;
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union acpi_object rom_arg_elements[2], *obj;
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struct acpi_object_list rom_arg;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
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rom_arg.count = 2;
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rom_arg.pointer = &rom_arg_elements[0];
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rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
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rom_arg_elements[0].integer.value = offset;
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rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
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rom_arg_elements[1].integer.value = length;
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status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
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if (ACPI_FAILURE(status)) {
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pr_info("failed to evaluate ROM got %s\n",
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acpi_format_exception(status));
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return -ENODEV;
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}
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obj = (union acpi_object *)buffer.pointer;
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length = min(length, obj->buffer.length);
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memcpy(bios+offset, obj->buffer.pointer, length);
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kfree(buffer.pointer);
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return length;
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#else
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return -EINVAL;
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#endif
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}
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/* This version of the shadow function disobeys the ACPI spec and tries
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* to fetch in units of more than 4KiB at a time. This is a LOT faster
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* on some systems, such as Lenovo W530.
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*/
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static u32
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acpi_read_fast(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
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{
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u32 limit = (offset + length + 0xfff) & ~0xfff;
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u32 start = offset & ~0x00000fff;
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u32 fetch = limit - start;
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if (nvbios_extend(bios, limit) >= 0) {
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int ret = acpi_read_bios(data, bios->data, start, fetch);
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if (ret == fetch)
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return fetch;
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}
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return 0;
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}
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/* Other systems, such as the one in fdo#55948, will report a success
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* but only return 4KiB of data. The common bios fetching logic will
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* detect an invalid image, and fall back to this version of the read
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* function.
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*/
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static u32
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acpi_read_slow(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
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{
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u32 limit = (offset + length + 0xfff) & ~0xfff;
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u32 start = offset & ~0xfff;
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u32 fetch = 0;
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if (nvbios_extend(bios, limit) >= 0) {
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while (start + fetch < limit) {
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int ret = acpi_read_bios(data, bios->data,
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start + fetch, 0x1000);
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if (ret != 0x1000)
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break;
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fetch += 0x1000;
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}
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}
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return fetch;
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}
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static void *
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acpi_init(struct nvkm_bios *bios, const char *name)
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{
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#if defined(CONFIG_ACPI) && defined(CONFIG_X86)
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acpi_status status;
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acpi_handle dhandle, rom_handle;
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dhandle = ACPI_HANDLE(bios->subdev.device->dev);
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if (!dhandle)
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return ERR_PTR(-ENODEV);
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status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
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if (ACPI_FAILURE(status))
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return ERR_PTR(-ENODEV);
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return rom_handle;
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#else
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return ERR_PTR(-ENODEV);
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#endif
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}
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const struct nvbios_source
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nvbios_acpi_fast = {
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.name = "ACPI",
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.init = acpi_init,
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.read = acpi_read_fast,
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.rw = false,
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.require_checksum = true,
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};
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const struct nvbios_source
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nvbios_acpi_slow = {
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.name = "ACPI",
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.init = acpi_init,
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.read = acpi_read_slow,
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.rw = false,
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};
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