mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 03:13:59 +00:00
97e492558f
We need to keep the pointer to the shadow vcpu somewhere accessible from within really early interrupt code. The best fit I found was the thread struct, as that resides in an SPRG. So let's put a pointer to the shadow vcpu in the thread struct and add an asm-offset so we can find it. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
373 lines
10 KiB
C
373 lines
10 KiB
C
#ifndef _ASM_POWERPC_PROCESSOR_H
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#define _ASM_POWERPC_PROCESSOR_H
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/*
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* Copyright (C) 2001 PPC 64 Team, IBM Corp
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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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#include <asm/reg.h>
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#ifdef CONFIG_VSX
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#define TS_FPRWIDTH 2
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#else
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#define TS_FPRWIDTH 1
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#endif
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#ifndef __ASSEMBLY__
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#include <linux/compiler.h>
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#include <asm/ptrace.h>
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#include <asm/types.h>
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/* We do _not_ want to define new machine types at all, those must die
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* in favor of using the device-tree
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* -- BenH.
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*/
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/* PREP sub-platform types see residual.h for these */
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#define _PREP_Motorola 0x01 /* motorola prep */
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#define _PREP_Firm 0x02 /* firmworks prep */
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#define _PREP_IBM 0x00 /* ibm prep */
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#define _PREP_Bull 0x03 /* bull prep */
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/* CHRP sub-platform types. These are arbitrary */
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#define _CHRP_Motorola 0x04 /* motorola chrp, the cobra */
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#define _CHRP_IBM 0x05 /* IBM chrp, the longtrail and longtrail 2 */
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#define _CHRP_Pegasos 0x06 /* Genesi/bplan's Pegasos and Pegasos2 */
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#define _CHRP_briq 0x07 /* TotalImpact's briQ */
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#if defined(__KERNEL__) && defined(CONFIG_PPC32)
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extern int _chrp_type;
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#ifdef CONFIG_PPC_PREP
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/* what kind of prep workstation we are */
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extern int _prep_type;
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#endif /* CONFIG_PPC_PREP */
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#endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
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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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/* Macros for adjusting thread priority (hardware multi-threading) */
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#define HMT_very_low() asm volatile("or 31,31,31 # very low priority")
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#define HMT_low() asm volatile("or 1,1,1 # low priority")
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#define HMT_medium_low() asm volatile("or 6,6,6 # medium low priority")
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#define HMT_medium() asm volatile("or 2,2,2 # medium priority")
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#define HMT_medium_high() asm volatile("or 5,5,5 # medium high priority")
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#define HMT_high() asm volatile("or 3,3,3 # high priority")
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#ifdef __KERNEL__
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struct task_struct;
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void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
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void release_thread(struct task_struct *);
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/* Prepare to copy thread state - unlazy all lazy status */
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extern void prepare_to_copy(struct task_struct *tsk);
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/* Create a new kernel thread. */
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extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
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/* Lazy FPU handling on uni-processor */
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extern struct task_struct *last_task_used_math;
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extern struct task_struct *last_task_used_altivec;
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extern struct task_struct *last_task_used_vsx;
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extern struct task_struct *last_task_used_spe;
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#ifdef CONFIG_PPC32
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#if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
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#error User TASK_SIZE overlaps with KERNEL_START address
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#endif
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#define TASK_SIZE (CONFIG_TASK_SIZE)
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/* This decides where the kernel will search for a free chunk of vm
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* space during mmap's.
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*/
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#define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
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#endif
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#ifdef CONFIG_PPC64
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/* 64-bit user address space is 44-bits (16TB user VM) */
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#define TASK_SIZE_USER64 (0x0000100000000000UL)
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/*
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* 32-bit user address space is 4GB - 1 page
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* (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
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*/
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#define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
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#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
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TASK_SIZE_USER32 : TASK_SIZE_USER64)
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#define TASK_SIZE TASK_SIZE_OF(current)
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/* This decides where the kernel will search for a free chunk of vm
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* space during mmap's.
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*/
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#define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
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#define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
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#define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
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TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
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#endif
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#ifdef __KERNEL__
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#ifdef __powerpc64__
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#define STACK_TOP_USER64 TASK_SIZE_USER64
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#define STACK_TOP_USER32 TASK_SIZE_USER32
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#define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
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STACK_TOP_USER32 : STACK_TOP_USER64)
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#define STACK_TOP_MAX STACK_TOP_USER64
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#else /* __powerpc64__ */
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#define STACK_TOP TASK_SIZE
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#define STACK_TOP_MAX STACK_TOP
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#endif /* __powerpc64__ */
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#endif /* __KERNEL__ */
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typedef struct {
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unsigned long seg;
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} mm_segment_t;
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#define TS_FPROFFSET 0
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#define TS_VSRLOWOFFSET 1
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#define TS_FPR(i) fpr[i][TS_FPROFFSET]
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struct thread_struct {
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unsigned long ksp; /* Kernel stack pointer */
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unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */
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#ifdef CONFIG_PPC64
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unsigned long ksp_vsid;
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#endif
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struct pt_regs *regs; /* Pointer to saved register state */
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mm_segment_t fs; /* for get_fs() validation */
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#ifdef CONFIG_PPC32
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void *pgdir; /* root of page-table tree */
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#endif
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#ifdef CONFIG_PPC_ADV_DEBUG_REGS
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/*
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* The following help to manage the use of Debug Control Registers
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* om the BookE platforms.
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*/
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unsigned long dbcr0;
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unsigned long dbcr1;
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#ifdef CONFIG_BOOKE
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unsigned long dbcr2;
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#endif
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/*
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* The stored value of the DBSR register will be the value at the
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* last debug interrupt. This register can only be read from the
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* user (will never be written to) and has value while helping to
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* describe the reason for the last debug trap. Torez
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*/
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unsigned long dbsr;
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/*
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* The following will contain addresses used by debug applications
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* to help trace and trap on particular address locations.
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* The bits in the Debug Control Registers above help define which
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* of the following registers will contain valid data and/or addresses.
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*/
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unsigned long iac1;
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unsigned long iac2;
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#if CONFIG_PPC_ADV_DEBUG_IACS > 2
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unsigned long iac3;
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unsigned long iac4;
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#endif
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unsigned long dac1;
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unsigned long dac2;
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#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
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unsigned long dvc1;
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unsigned long dvc2;
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#endif
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#endif
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/* FP and VSX 0-31 register set */
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double fpr[32][TS_FPRWIDTH];
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struct {
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unsigned int pad;
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unsigned int val; /* Floating point status */
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} fpscr;
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int fpexc_mode; /* floating-point exception mode */
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unsigned int align_ctl; /* alignment handling control */
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#ifdef CONFIG_PPC64
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unsigned long start_tb; /* Start purr when proc switched in */
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unsigned long accum_tb; /* Total accumilated purr for process */
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#endif
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unsigned long dabr; /* Data address breakpoint register */
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#ifdef CONFIG_ALTIVEC
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/* Complete AltiVec register set */
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vector128 vr[32] __attribute__((aligned(16)));
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/* AltiVec status */
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vector128 vscr __attribute__((aligned(16)));
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unsigned long vrsave;
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int used_vr; /* set if process has used altivec */
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#endif /* CONFIG_ALTIVEC */
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#ifdef CONFIG_VSX
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/* VSR status */
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int used_vsr; /* set if process has used altivec */
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#endif /* CONFIG_VSX */
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#ifdef CONFIG_SPE
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unsigned long evr[32]; /* upper 32-bits of SPE regs */
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u64 acc; /* Accumulator */
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unsigned long spefscr; /* SPE & eFP status */
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int used_spe; /* set if process has used spe */
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#endif /* CONFIG_SPE */
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#ifdef CONFIG_KVM_BOOK3S_32_HANDLER
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void* kvm_shadow_vcpu; /* KVM internal data */
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#endif /* CONFIG_KVM_BOOK3S_32_HANDLER */
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};
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#define ARCH_MIN_TASKALIGN 16
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#define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
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#define INIT_SP_LIMIT \
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(_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack)
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#ifdef CONFIG_SPE
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#define SPEFSCR_INIT .spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE,
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#else
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#define SPEFSCR_INIT
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#endif
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#ifdef CONFIG_PPC32
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#define INIT_THREAD { \
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.ksp = INIT_SP, \
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.ksp_limit = INIT_SP_LIMIT, \
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.fs = KERNEL_DS, \
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.pgdir = swapper_pg_dir, \
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.fpexc_mode = MSR_FE0 | MSR_FE1, \
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SPEFSCR_INIT \
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}
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#else
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#define INIT_THREAD { \
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.ksp = INIT_SP, \
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.ksp_limit = INIT_SP_LIMIT, \
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.regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
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.fs = KERNEL_DS, \
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.fpr = {{0}}, \
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.fpscr = { .val = 0, }, \
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.fpexc_mode = 0, \
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}
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#endif
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/*
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* Return saved PC of a blocked thread. For now, this is the "user" PC
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*/
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#define thread_saved_pc(tsk) \
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((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
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#define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.regs)
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unsigned long get_wchan(struct task_struct *p);
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#define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
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#define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
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/* Get/set floating-point exception mode */
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#define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
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#define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
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extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
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extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
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#define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
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#define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
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extern int get_endian(struct task_struct *tsk, unsigned long adr);
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extern int set_endian(struct task_struct *tsk, unsigned int val);
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#define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr))
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#define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val))
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extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
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extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
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static inline unsigned int __unpack_fe01(unsigned long msr_bits)
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{
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return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
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}
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static inline unsigned long __pack_fe01(unsigned int fpmode)
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{
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return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
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}
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#ifdef CONFIG_PPC64
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#define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0)
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#else
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#define cpu_relax() barrier()
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#endif
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/* Check that a certain kernel stack pointer is valid in task_struct p */
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int validate_sp(unsigned long sp, struct task_struct *p,
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unsigned long nbytes);
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/*
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* Prefetch macros.
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*/
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#define ARCH_HAS_PREFETCH
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#define ARCH_HAS_PREFETCHW
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#define ARCH_HAS_SPINLOCK_PREFETCH
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static inline void prefetch(const void *x)
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{
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if (unlikely(!x))
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return;
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__asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
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}
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static inline void prefetchw(const void *x)
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{
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if (unlikely(!x))
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return;
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__asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
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}
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#define spin_lock_prefetch(x) prefetchw(x)
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#ifdef CONFIG_PPC64
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#define HAVE_ARCH_PICK_MMAP_LAYOUT
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#endif
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#ifdef CONFIG_PPC64
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static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32)
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{
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unsigned long sp;
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if (is_32)
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sp = regs->gpr[1] & 0x0ffffffffUL;
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else
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sp = regs->gpr[1];
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return sp;
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}
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#else
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static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32)
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{
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return regs->gpr[1];
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}
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#endif
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#endif /* __KERNEL__ */
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_POWERPC_PROCESSOR_H */
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