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https://github.com/brain-hackers/u-boot-brain
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35b65dd8ef
Historically, the reset_cpu() function had an `addr` parameter which was
meant to pass in an address of the reset vector location, where the CPU
should reset to. This feature is no longer used anywhere in U-Boot as
all reset_cpu() implementations now ignore the passed value. Generic
code has been added which always calls reset_cpu() with `0` which means
this feature can no longer be used easily anyway.
Over time, many implementations seem to have "misunderstood" the
existence of this parameter as a way to customize/parameterize the reset
(e.g. COLD vs WARM resets). As this is not properly supported, the
code will almost always not do what it is intended to (because all
call-sites just call reset_cpu() with 0).
To avoid confusion and to clean up the codebase from unused left-overs
of the past, remove the `addr` parameter entirely. Code which intends
to support different kinds of resets should be rewritten as a sysreset
driver instead.
This transformation was done with the following coccinelle patch:
@@
expression argvalue;
@@
- reset_cpu(argvalue)
+ reset_cpu()
@@
identifier argname;
type argtype;
@@
- reset_cpu(argtype argname)
+ reset_cpu(void)
{ ... }
Signed-off-by: Harald Seiler <hws@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
99 lines
1.8 KiB
C
99 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2015
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* Kamil Lulko, <kamil.lulko@gmail.com>
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*/
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#include <common.h>
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#include <cpu_func.h>
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#include <irq_func.h>
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/*
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* Upon exception entry ARMv7-M processors automatically save stack
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* frames containing some registers. For simplicity initial
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* implementation uses only this auto-saved stack frame.
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* This does not contain complete register set dump,
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* only R0-R3, R12, LR, PC and xPSR are saved.
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*/
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struct autosave_regs {
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long uregs[8];
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};
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#define ARM_XPSR uregs[7]
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#define ARM_PC uregs[6]
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#define ARM_LR uregs[5]
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#define ARM_R12 uregs[4]
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#define ARM_R3 uregs[3]
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#define ARM_R2 uregs[2]
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#define ARM_R1 uregs[1]
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#define ARM_R0 uregs[0]
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int interrupt_init(void)
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{
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enable_interrupts();
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return 0;
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}
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void enable_interrupts(void)
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{
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return;
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}
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int disable_interrupts(void)
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{
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return 0;
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}
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void dump_regs(struct autosave_regs *regs)
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{
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printf("pc : %08lx lr : %08lx xPSR : %08lx\n",
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regs->ARM_PC, regs->ARM_LR, regs->ARM_XPSR);
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printf("r12 : %08lx r3 : %08lx r2 : %08lx\n"
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"r1 : %08lx r0 : %08lx\n",
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regs->ARM_R12, regs->ARM_R3, regs->ARM_R2,
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regs->ARM_R1, regs->ARM_R0);
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}
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void bad_mode(void)
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{
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panic("Resetting CPU ...\n");
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reset_cpu();
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}
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void do_hard_fault(struct autosave_regs *autosave_regs)
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{
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printf("Hard fault\n");
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dump_regs(autosave_regs);
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bad_mode();
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}
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void do_mm_fault(struct autosave_regs *autosave_regs)
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{
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printf("Memory management fault\n");
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dump_regs(autosave_regs);
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bad_mode();
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}
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void do_bus_fault(struct autosave_regs *autosave_regs)
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{
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printf("Bus fault\n");
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dump_regs(autosave_regs);
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bad_mode();
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}
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void do_usage_fault(struct autosave_regs *autosave_regs)
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{
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printf("Usage fault\n");
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dump_regs(autosave_regs);
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bad_mode();
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}
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void do_invalid_entry(struct autosave_regs *autosave_regs)
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{
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printf("Exception\n");
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dump_regs(autosave_regs);
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bad_mode();
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}
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