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If CSRs like seed are readable by S-mode, may not be determinable by S-mode. For safe driver probing allow to resume via a longjmp after an exception. Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#include <asm/setjmp.h>
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/**
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* struct resume_data - data for resume after interrupt
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*/
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struct resume_data {
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/** @jump: longjmp buffer */
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jmp_buf jump;
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/** @code: exception code */
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ulong code;
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};
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/**
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* set_resume() - set longjmp buffer for resuming after exception
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*
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* By calling this function it is possible to use a long jump to catch an
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* exception. The caller sets the long jump buffer with set_resume() and then
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* executes setjmp(). If an exception occurs, the code will return to the
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* setjmp caller(). The exception code will be returned in @data->code.
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*
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* After the critical operation call set_resume(NULL) so that an exception in
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* another part of the code will not accidently invoke the long jump.
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*
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* .. code-block:: c
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*
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* // This example shows how to use set_resume().
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*
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* struct resume_data resume;
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* int ret;
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*
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* set_resume(&resume);
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* ret = setjmp(resume.jump);
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* if (ret) {
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* printf("An exception %ld occurred\n", resume.code);
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* } else {
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* // Do what might raise an exception here.
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* }
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* set_resume(NULL);
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*
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* @data: pointer to structure with longjmp address
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* Return: 0 before an exception, 1 after an exception occurred
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*/
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void set_resume(struct resume_data *data);
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