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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d5b4bb4d10
Pull the MCA deletion branch from Paul Gortmaker:
"It was good that we could support MCA machines back in the day, but
realistically, nobody is using them anymore. They were mostly limited
to 386-sx 16MHz CPU and some 486 class machines and never more than
64MB of RAM. Even the enthusiast hobbyist community seems to have
dried up close to ten years ago, based on what you can find searching
various websites dedicated to the relatively short lived hardware.
So lets remove the support relating to CONFIG_MCA. There is no point
carrying this forward, wasting cycles doing routine maintenance on it;
wasting allyesconfig build time on validating it, wasting I/O on git
grep'ping over it, and so on."
Let's see if anybody screams. It generally has compiled, and James
Bottomley pointed out that there was a MCA extension from NCR that
allowed for up to 4GB of memory and PPro-class machines. So in *theory*
there may be users out there.
But even James (technically listed as a maintainer) doesn't actually
have a system, and while Alan Cox claims to have a machine in his cellar
that he offered to anybody who wants to take it off his hands, he didn't
argue for keeping MCA support either.
So we could bring it back. But somebody had better speak up and talk
about how they have actually been using said MCA hardware with modern
kernels for us to do that. And David already took the patch to delete
all the networking driver code (commit a5e371f61a: "drivers/net:
delete all code/drivers depending on CONFIG_MCA").
* 'delete-mca' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux:
MCA: delete all remaining traces of microchannel bus support.
scsi: delete the MCA specific drivers and driver code
serial: delete the MCA specific 8250 support.
arm: remove ability to select CONFIG_MCA
146 lines
3.7 KiB
C
146 lines
3.7 KiB
C
/* processor.h: FRV processor definitions
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*
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* Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _ASM_PROCESSOR_H
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#define _ASM_PROCESSOR_H
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#include <asm/mem-layout.h>
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#ifndef __ASSEMBLY__
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/*
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* Default implementation of macro that returns current
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* instruction pointer ("program counter").
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*/
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#define current_text_addr() ({ __label__ _l; _l: &&_l;})
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#include <linux/compiler.h>
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#include <linux/linkage.h>
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#include <asm/sections.h>
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#include <asm/segment.h>
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#include <asm/fpu.h>
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#include <asm/registers.h>
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#include <asm/ptrace.h>
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#include <asm/current.h>
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#include <asm/cache.h>
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/* Forward declaration, a strange C thing */
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struct task_struct;
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/*
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* CPU type and hardware bug flags. Kept separately for each CPU.
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*/
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struct cpuinfo_frv {
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#ifdef CONFIG_MMU
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unsigned long *pgd_quick;
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unsigned long *pte_quick;
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unsigned long pgtable_cache_sz;
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#endif
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} __cacheline_aligned;
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extern struct cpuinfo_frv __nongprelbss boot_cpu_data;
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#define cpu_data (&boot_cpu_data)
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#define current_cpu_data boot_cpu_data
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/*
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* Bus types
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*/
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#define EISA_bus 0
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struct thread_struct {
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struct pt_regs *frame; /* [GR28] exception frame ptr for this thread */
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struct task_struct *curr; /* [GR29] current pointer for this thread */
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unsigned long sp; /* [GR1 ] kernel stack pointer */
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unsigned long fp; /* [GR2 ] kernel frame pointer */
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unsigned long lr; /* link register */
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unsigned long pc; /* program counter */
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unsigned long gr[12]; /* [GR16-GR27] */
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unsigned long sched_lr; /* LR from schedule() */
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union {
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struct pt_regs *frame0; /* top (user) stack frame */
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struct user_context *user; /* userspace context */
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};
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} __attribute__((aligned(8)));
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extern struct pt_regs *__kernel_frame0_ptr;
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extern struct task_struct *__kernel_current_task;
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#endif
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#ifndef __ASSEMBLY__
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#define INIT_THREAD_FRAME0 \
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((struct pt_regs *) \
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(sizeof(init_stack) + (unsigned long) init_stack - sizeof(struct user_context)))
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#define INIT_THREAD { \
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NULL, \
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(struct task_struct *) init_stack, \
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0, 0, 0, 0, \
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, \
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0, \
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{ INIT_THREAD_FRAME0 }, \
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}
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/*
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* do necessary setup to start up a newly executed thread.
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* - need to discard the frame stacked by init() invoking the execve syscall
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*/
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#define start_thread(_regs, _pc, _usp) \
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do { \
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__frame = __kernel_frame0_ptr; \
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__frame->pc = (_pc); \
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__frame->psr &= ~PSR_S; \
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__frame->sp = (_usp); \
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} while(0)
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/* Free all resources held by a thread. */
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static inline void release_thread(struct task_struct *dead_task)
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{
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}
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extern asmlinkage int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
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extern asmlinkage void save_user_regs(struct user_context *target);
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extern asmlinkage void *restore_user_regs(const struct user_context *target, ...);
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#define copy_segments(tsk, mm) do { } while (0)
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#define release_segments(mm) do { } while (0)
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#define forget_segments() do { } while (0)
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/*
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* Free current thread data structures etc..
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*/
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static inline void exit_thread(void)
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{
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}
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/*
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* Return saved PC of a blocked thread.
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*/
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extern unsigned long thread_saved_pc(struct task_struct *tsk);
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unsigned long get_wchan(struct task_struct *p);
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#define KSTK_EIP(tsk) ((tsk)->thread.frame0->pc)
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#define KSTK_ESP(tsk) ((tsk)->thread.frame0->sp)
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#define cpu_relax() barrier()
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/* data cache prefetch */
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#define ARCH_HAS_PREFETCH
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static inline void prefetch(const void *x)
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{
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asm volatile("dcpl %0,gr0,#0" : : "r"(x));
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}
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_PROCESSOR_H */
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