Release 4.14 arch/metag/include/asm/processor.h
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2005,2006,2007,2008 Imagination Technologies
*/
#ifndef __ASM_METAG_PROCESSOR_H
#define __ASM_METAG_PROCESSOR_H
#include <linux/atomic.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/metag_regs.h>
/*
* Default implementation of macro that returns current
* instruction pointer ("program counter").
*/
#define current_text_addr() ({ __label__ _l; _l: &&_l; })
/* The task stops where the kernel starts */
#define TASK_SIZE PAGE_OFFSET
/* Add an extra page of padding at the top of the stack for the guard page. */
#define STACK_TOP (TASK_SIZE - PAGE_SIZE)
#define STACK_TOP_MAX STACK_TOP
/* Maximum virtual space for stack */
#define STACK_SIZE_MAX (CONFIG_MAX_STACK_SIZE_MB*1024*1024)
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
#define TASK_UNMAPPED_BASE META_MEMORY_BASE
typedef struct {
unsigned long seg;
} mm_segment_t;
#ifdef CONFIG_METAG_FPU
struct meta_fpu_context {
TBICTXEXTFPU fpstate;
union {
struct {
TBICTXEXTBB4 fx8_15;
TBICTXEXTFPACC fpacc;
} fx8_15;
struct {
TBICTXEXTFPACC fpacc;
TBICTXEXTBB4 unused;
} nofx8_15;
} extfpstate;
bool needs_restore;
};
#else
struct meta_fpu_context {};
#endif
#ifdef CONFIG_METAG_DSP
struct meta_ext_context {
struct {
TBIEXTCTX ctx;
TBICTXEXTBB8 bb8;
TBIDUAL ax[TBICTXEXTAXX_BYTES / sizeof(TBIDUAL)];
TBICTXEXTHL2 hl2;
TBICTXEXTTDPR ext;
TBICTXEXTRP6 rp;
} regs;
/* DSPRAM A and B save areas. */
void *ram[2];
/* ECH encoded size of DSPRAM save areas. */
unsigned int ram_sz[2];
};
#else
struct meta_ext_context {};
#endif
struct thread_struct {
PTBICTX kernel_context;
/* A copy of the user process Sig.SaveMask. */
unsigned int user_flags;
struct meta_fpu_context *fpu_context;
void __user *tls_ptr;
unsigned short int_depth;
unsigned short txdefr_failure;
struct meta_ext_context *dsp_context;
};
#define INIT_THREAD { \
NULL, /* kernel_context */ \
0, /* user_flags */ \
NULL, /* fpu_context */ \
NULL, /* tls_ptr */ \
1, /* int_depth - we start in kernel */ \
0, /* txdefr_failure */ \
NULL, /* dsp_context */ \
}
/* Needed to make #define as we are referencing 'current', that is not visible
* yet.
*
* Stack layout is as below.
argc argument counter (integer)
argv[0] program name (pointer)
argv[1...N] program args (pointers)
argv[argc-1] end of args (integer)
NULL
env[0...N] environment variables (pointers)
NULL
*/
#define start_thread(regs, pc, usp) do { \
unsigned int *argc = (unsigned int *) bprm->exec; \
current->thread.int_depth = 1; \
/* Force this process down to user land */ \
regs->ctx.SaveMask = TBICTX_PRIV_BIT; \
regs->ctx.CurrPC = pc; \
regs->ctx.AX[0].U0 = usp; \
regs->ctx.DX[3].U1 = *((int *)argc); /* argc */ \
regs->ctx.DX[3].U0 = (int)((int *)argc + 1); /* argv */ \
regs->ctx.DX[2].U1 = (int)((int *)argc + \
regs->ctx.DX[3].U1 + 2); /* envp */ \
regs->ctx.DX[2].U0 = 0; /* rtld_fini */ \
} while (0)
/* Forward declaration, a strange C thing */
struct task_struct;
/* Free all resources held by a thread. */
static inline void release_thread(struct task_struct *dead_task)
{
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| James Hogan | 11 | 100.00% | 1 | 100.00% |
| Total | 11 | 100.00% | 1 | 100.00% |
/*
* Return saved PC of a blocked thread.
*/
#define thread_saved_pc(tsk) \
((unsigned long)(tsk)->thread.kernel_context->CurrPC)
#define thread_saved_sp(tsk) \
((unsigned long)(tsk)->thread.kernel_context->AX[0].U0)
#define thread_saved_fp(tsk) \
((unsigned long)(tsk)->thread.kernel_context->AX[1].U0)
unsigned long get_wchan(struct task_struct *p);
#define KSTK_EIP(tsk) (task_pt_regs(tsk)->ctx.CurrPC)
#define KSTK_ESP(tsk) (task_pt_regs(tsk)->ctx.AX[0].U0)
#define user_stack_pointer(regs) ((regs)->ctx.AX[0].U0)
#define cpu_relax() barrier()
extern void setup_priv(void);
static inline unsigned int hard_processor_id(void)
{
unsigned int id;
asm volatile ("MOV %0, TXENABLE\n"
"AND %0, %0, %1\n"
"LSR %0, %0, %2\n"
: "=&d" (id)
: "I" (TXENABLE_THREAD_BITS),
"K" (TXENABLE_THREAD_S)
);
return id;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| James Hogan | 20 | 100.00% | 1 | 100.00% |
| Total | 20 | 100.00% | 1 | 100.00% |
#define OP3_EXIT 0
#define HALT_OK 0
#define HALT_PANIC -1
/*
* Halt (stop) the hardware thread. This instruction sequence is the
* standard way to cause a Meta hardware thread to exit. The exit code
* is pushed onto the stack which is interpreted by the debug adapter.
*/
static inline void hard_processor_halt(int exit_code)
{
asm volatile ("MOV D1Ar1, %0\n"
"MOV D0Ar6, %1\n"
"MSETL [A0StP],D0Ar6,D0Ar4,D0Ar2\n"
"1:\n"
"SWITCH #0xC30006\n"
"B 1b\n"
: : "r" (exit_code), "K" (OP3_EXIT));
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| James Hogan | 13 | 100.00% | 1 | 100.00% |
| Total | 13 | 100.00% | 1 | 100.00% |
/* Set these hooks to call SoC specific code to restart/halt/power off. */
extern void (*soc_restart)(char *cmd);
extern void (*soc_halt)(void);
extern void show_trace(struct task_struct *tsk, unsigned long *sp,
struct pt_regs *regs);
extern const struct seq_operations cpuinfo_op;
#endif
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| James Hogan | 420 | 97.90% | 4 | 50.00% |
| Markos Chandras | 6 | 1.40% | 1 | 12.50% |
| Greg Kroah-Hartman | 1 | 0.23% | 1 | 12.50% |
| Helge Deller | 1 | 0.23% | 1 | 12.50% |
| Al Viro | 1 | 0.23% | 1 | 12.50% |
| Total | 429 | 100.00% | 8 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.