1 #ifndef _ASM_POWERPC_PROCESSOR_H
2 #define _ASM_POWERPC_PROCESSOR_H
5 * Copyright (C) 2001 PPC 64 Team, IBM Corp
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
16 #include <linux/compiler.h>
17 #include <asm/ptrace.h>
18 #include <asm/types.h>
20 /* We do _not_ want to define new machine types at all, those must die
21 * in favor of using the device-tree
25 /* PREP sub-platform types see residual.h for these */
26 #define _PREP_Motorola 0x01 /* motorola prep */
27 #define _PREP_Firm 0x02 /* firmworks prep */
28 #define _PREP_IBM 0x00 /* ibm prep */
29 #define _PREP_Bull 0x03 /* bull prep */
31 /* CHRP sub-platform types. These are arbitrary */
32 #define _CHRP_Motorola 0x04 /* motorola chrp, the cobra */
33 #define _CHRP_IBM 0x05 /* IBM chrp, the longtrail and longtrail 2 */
34 #define _CHRP_Pegasos 0x06 /* Genesi/bplan's Pegasos and Pegasos2 */
35 #define _CHRP_briq 0x07 /* TotalImpact's briQ */
37 #if defined(__KERNEL__) && defined(CONFIG_PPC32)
39 extern int _chrp_type;
41 #ifdef CONFIG_PPC_PREP
43 /* what kind of prep workstation we are */
44 extern int _prep_type;
47 * This is used to identify the board type from a given PReP board
48 * vendor. Board revision is also made available. This will be moved
51 extern unsigned char ucBoardRev;
52 extern unsigned char ucBoardRevMaj, ucBoardRevMin;
54 #endif /* CONFIG_PPC_PREP */
56 #endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
59 * Default implementation of macro that returns current
60 * instruction pointer ("program counter").
62 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
64 /* Macros for adjusting thread priority (hardware multi-threading) */
65 #define HMT_very_low() asm volatile("or 31,31,31 # very low priority")
66 #define HMT_low() asm volatile("or 1,1,1 # low priority")
67 #define HMT_medium_low() asm volatile("or 6,6,6 # medium low priority")
68 #define HMT_medium() asm volatile("or 2,2,2 # medium priority")
69 #define HMT_medium_high() asm volatile("or 5,5,5 # medium high priority")
70 #define HMT_high() asm volatile("or 3,3,3 # high priority")
77 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
78 void release_thread(struct task_struct *);
80 /* Prepare to copy thread state - unlazy all lazy status */
81 extern void prepare_to_copy(struct task_struct *tsk);
83 /* Create a new kernel thread. */
84 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
86 /* Lazy FPU handling on uni-processor */
87 extern struct task_struct *last_task_used_math;
88 extern struct task_struct *last_task_used_altivec;
89 extern struct task_struct *last_task_used_spe;
92 #define TASK_SIZE (CONFIG_TASK_SIZE)
94 /* This decides where the kernel will search for a free chunk of vm
95 * space during mmap's.
97 #define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
101 /* 64-bit user address space is 44-bits (16TB user VM) */
102 #define TASK_SIZE_USER64 (0x0000100000000000UL)
105 * 32-bit user address space is 4GB - 1 page
106 * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
108 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
110 #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
111 TASK_SIZE_USER32 : TASK_SIZE_USER64)
113 /* This decides where the kernel will search for a free chunk of vm
114 * space during mmap's.
116 #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
117 #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
119 #define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
120 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
127 struct thread_struct {
128 unsigned long ksp; /* Kernel stack pointer */
130 unsigned long ksp_vsid;
132 struct pt_regs *regs; /* Pointer to saved register state */
133 mm_segment_t fs; /* for get_fs() validation */
135 void *pgdir; /* root of page-table tree */
136 signed long last_syscall;
138 #if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
139 unsigned long dbcr0; /* debug control register values */
142 double fpr[32]; /* Complete floating point set */
143 struct { /* fpr ... fpscr must be contiguous */
146 unsigned int val; /* Floating point status */
148 int fpexc_mode; /* floating-point exception mode */
149 unsigned int align_ctl; /* alignment handling control */
151 unsigned long start_tb; /* Start purr when proc switched in */
152 unsigned long accum_tb; /* Total accumilated purr for process */
154 unsigned long dabr; /* Data address breakpoint register */
155 #ifdef CONFIG_ALTIVEC
156 /* Complete AltiVec register set */
157 vector128 vr[32] __attribute((aligned(16)));
159 vector128 vscr __attribute((aligned(16)));
160 unsigned long vrsave;
161 int used_vr; /* set if process has used altivec */
162 #endif /* CONFIG_ALTIVEC */
164 unsigned long evr[32]; /* upper 32-bits of SPE regs */
165 u64 acc; /* Accumulator */
166 unsigned long spefscr; /* SPE & eFP status */
167 int used_spe; /* set if process has used spe */
168 #endif /* CONFIG_SPE */
171 #define ARCH_MIN_TASKALIGN 16
173 #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
177 #define INIT_THREAD { \
180 .pgdir = swapper_pg_dir, \
181 .fpexc_mode = MSR_FE0 | MSR_FE1, \
184 #define INIT_THREAD { \
186 .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
189 .fpscr = { .val = 0, }, \
195 * Return saved PC of a blocked thread. For now, this is the "user" PC
197 #define thread_saved_pc(tsk) \
198 ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
200 unsigned long get_wchan(struct task_struct *p);
202 #define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
203 #define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
205 /* Get/set floating-point exception mode */
206 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
207 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
209 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
210 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
212 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
213 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
215 extern int get_endian(struct task_struct *tsk, unsigned long adr);
216 extern int set_endian(struct task_struct *tsk, unsigned int val);
218 #define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr))
219 #define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val))
221 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
222 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
224 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
226 return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
229 static inline unsigned long __pack_fe01(unsigned int fpmode)
231 return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
235 #define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0)
237 #define cpu_relax() barrier()
240 /* Check that a certain kernel stack pointer is valid in task_struct p */
241 int validate_sp(unsigned long sp, struct task_struct *p,
242 unsigned long nbytes);
247 #define ARCH_HAS_PREFETCH
248 #define ARCH_HAS_PREFETCHW
249 #define ARCH_HAS_SPINLOCK_PREFETCH
251 static inline void prefetch(const void *x)
256 __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
259 static inline void prefetchw(const void *x)
264 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
267 #define spin_lock_prefetch(x) prefetchw(x)
270 #define HAVE_ARCH_PICK_MMAP_LAYOUT
273 #endif /* __KERNEL__ */
274 #endif /* __ASSEMBLY__ */
275 #endif /* _ASM_POWERPC_PROCESSOR_H */