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da8d32dc8d
This is more reliable than reading them through FDT/ACPI, since it reflects the positions as shown to verified boot code. Notes: 1. This affects ALL platforms with virtual dev switches (x86 AND arm) 2. The fix should have no effect on older platforms, but I haven't tested those. BUG=chrome-os-partner:11805 TEST=manual 1. boot in normal mode. devsw_boot = 0 # Developer switch position at boot recovery_reason = 0 # Recovery mode reason for current boot recoverysw_boot = 0 # Recovery switch position at boot wpsw_boot = 1 # Firmware write protect hardware switch position at boot 2. boot in developer mode. localhost ~ # crossystem devsw_boot = 1 # Developer switch position at boot recovery_reason = 0 # Recovery mode reason for current boot recoverysw_boot = 0 # Recovery switch position at boot wpsw_boot = 1 # Firmware write protect hardware switch position at boot 3. boot in developer-recovery mode using keyboard combo. devsw_boot = 1 # Developer switch position at boot recovery_reason = 2 # Recovery mode reason for current boot recoverysw_boot = 1 # Recovery switch position at boot wpsw_boot = 1 # Firmware write protect hardware switch position at boot 4. disable WP and reboot. wpsw_boot should be 0. Change-Id: If4156b5e14c6923c5b331c7e5feaabbffe1dad37 Reviewed-on: https://gerrit.chromium.org/gerrit/29199 Commit-Ready: Randall Spangler <rspangler@chromium.org> Reviewed-by: Randall Spangler <rspangler@chromium.org> Tested-by: Randall Spangler <rspangler@chromium.org>
92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Architecture-specific APIs for crossystem
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*/
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#ifndef VBOOT_REFERENCE_CROSSYSTEM_ARCH_H_
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#define VBOOT_REFERENCE_CROSSYSTEM_ARCH_H_
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#include "vboot_nvstorage.h"
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#include "vboot_struct.h"
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/* Firmware types from BINF.3. Placed in the common file because both x86 and
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* arm use this. The constants are defined in "Chrome OS Main Processor
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* Firmware Spec"
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*/
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#define BINF3_RECOVERY 0
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#define BINF3_NORMAL 1
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#define BINF3_DEVELOPER 2
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#define BINF3_NETBOOT 3
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/* INTERNAL APIS FOR CROSSYSTEM AVAILABLE TO ARCH-SPECIFIC FUNCTIONS */
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/* Read an integer property from VbNvStorage.
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*
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* Returns the parameter value, or -1 if error. */
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int VbGetNvStorage(VbNvParam param);
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/* Write an integer property to VbNvStorage.
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*
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* Returns 0 if success, -1 if error. */
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int VbSetNvStorage(VbNvParam param, int value);
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/* Return true if the FWID starts with the specified string. */
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int FwidStartsWith(const char *start);
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/* Return version of VbSharedData struct or -1 if not found. */
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int VbSharedDataVersion(void);
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/* Apis WITH ARCH-SPECIFIC IMPLEMENTATIONS */
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/* Read the non-volatile context from NVRAM.
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*
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* Returns 0 if success, -1 if error. */
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int VbReadNvStorage(VbNvContext* vnc);
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/* Write the non-volatile context to NVRAM.
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*
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* Returns 0 if success, -1 if error. */
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int VbWriteNvStorage(VbNvContext* vnc);
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/* Read the VbSharedData buffer.
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*
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* Verifies the buffer contains at least enough data for the
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* VbSharedDataHeader; if not, this is an error.
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*
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* If less data is read than expected, sets the returned structure's data_size
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* to the actual amount of data read. If this is less than data_used, then
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* some data was not returned; callers must handle this; this is not considered
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* an error.
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*
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* Returns the data buffer, which must be freed by the caller using
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* free(), or NULL if error. */
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VbSharedDataHeader* VbSharedDataRead(void);
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/* Read an architecture-specific system property integer.
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*
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* Returns the property value, or -1 if error. */
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int VbGetArchPropertyInt(const char* name);
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/* Read an architecture-specific system property string into a
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* destination buffer of the specified size. Returned string will be
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* null-terminated. If the buffer is too small, the returned string
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* will be truncated.
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*
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* Returns the passed buffer, or NULL if error. */
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const char* VbGetArchPropertyString(const char* name, char* dest, int size);
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/* Set an architecture-specific system property integer.
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*
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* Returns 0 if success, -1 if error. */
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int VbSetArchPropertyInt(const char* name, int value);
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/* Set an architecture-specific system property string.
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*
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* Returns 0 if success, -1 if error. */
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int VbSetArchPropertyString(const char* name, const char* value);
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#endif /* VBOOT_REFERENCE__CROSSYSTEM_ARCH_H_ */
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