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.
22 #include <linux/compiler.h>
23 #include <asm/ptrace.h>
24 #include <asm/types.h>
26 /* We do _not_ want to define new machine types at all, those must die
27 * in favor of using the device-tree
31 /* PREP sub-platform types see residual.h for these */
32 #define _PREP_Motorola 0x01 /* motorola prep */
33 #define _PREP_Firm 0x02 /* firmworks prep */
34 #define _PREP_IBM 0x00 /* ibm prep */
35 #define _PREP_Bull 0x03 /* bull prep */
37 /* CHRP sub-platform types. These are arbitrary */
38 #define _CHRP_Motorola 0x04 /* motorola chrp, the cobra */
39 #define _CHRP_IBM 0x05 /* IBM chrp, the longtrail and longtrail 2 */
40 #define _CHRP_Pegasos 0x06 /* Genesi/bplan's Pegasos and Pegasos2 */
41 #define _CHRP_briq 0x07 /* TotalImpact's briQ */
43 #if defined(__KERNEL__) && defined(CONFIG_PPC32)
45 extern int _chrp_type;
47 #ifdef CONFIG_PPC_PREP
49 /* what kind of prep workstation we are */
50 extern int _prep_type;
52 #endif /* CONFIG_PPC_PREP */
54 #endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
57 * Default implementation of macro that returns current
58 * instruction pointer ("program counter").
60 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
62 /* Macros for adjusting thread priority (hardware multi-threading) */
63 #define HMT_very_low() asm volatile("or 31,31,31 # very low priority")
64 #define HMT_low() asm volatile("or 1,1,1 # low priority")
65 #define HMT_medium_low() asm volatile("or 6,6,6 # medium low priority")
66 #define HMT_medium() asm volatile("or 2,2,2 # medium priority")
67 #define HMT_medium_high() asm volatile("or 5,5,5 # medium high priority")
68 #define HMT_high() asm volatile("or 3,3,3 # high priority")
75 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
76 void release_thread(struct task_struct *);
78 /* Prepare to copy thread state - unlazy all lazy status */
79 extern void prepare_to_copy(struct task_struct *tsk);
81 /* Create a new kernel thread. */
82 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
84 /* Lazy FPU handling on uni-processor */
85 extern struct task_struct *last_task_used_math;
86 extern struct task_struct *last_task_used_altivec;
87 extern struct task_struct *last_task_used_vsx;
88 extern struct task_struct *last_task_used_spe;
92 #if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
93 #error User TASK_SIZE overlaps with KERNEL_START address
95 #define TASK_SIZE (CONFIG_TASK_SIZE)
97 /* This decides where the kernel will search for a free chunk of vm
98 * space during mmap's.
100 #define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
104 /* 64-bit user address space is 44-bits (16TB user VM) */
105 #define TASK_SIZE_USER64 (0x0000100000000000UL)
108 * 32-bit user address space is 4GB - 1 page
109 * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
111 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
113 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
114 TASK_SIZE_USER32 : TASK_SIZE_USER64)
115 #define TASK_SIZE TASK_SIZE_OF(current)
117 /* This decides where the kernel will search for a free chunk of vm
118 * space during mmap's.
120 #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
121 #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
123 #define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
124 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
130 #define STACK_TOP_USER64 TASK_SIZE_USER64
131 #define STACK_TOP_USER32 TASK_SIZE_USER32
133 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
134 STACK_TOP_USER32 : STACK_TOP_USER64)
136 #define STACK_TOP_MAX STACK_TOP_USER64
138 #else /* __powerpc64__ */
140 #define STACK_TOP TASK_SIZE
141 #define STACK_TOP_MAX STACK_TOP
143 #endif /* __powerpc64__ */
144 #endif /* __KERNEL__ */
150 #define TS_FPROFFSET 0
151 #define TS_VSRLOWOFFSET 1
152 #define TS_FPR(i) fpr[i][TS_FPROFFSET]
154 struct thread_struct {
155 unsigned long ksp; /* Kernel stack pointer */
156 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */
159 unsigned long ksp_vsid;
161 struct pt_regs *regs; /* Pointer to saved register state */
162 mm_segment_t fs; /* for get_fs() validation */
164 void *pgdir; /* root of page-table tree */
166 #if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
167 unsigned long dbcr0; /* debug control register values */
170 /* FP and VSX 0-31 register set */
171 double fpr[32][TS_FPRWIDTH];
175 unsigned int val; /* Floating point status */
177 int fpexc_mode; /* floating-point exception mode */
178 unsigned int align_ctl; /* alignment handling control */
180 unsigned long start_tb; /* Start purr when proc switched in */
181 unsigned long accum_tb; /* Total accumilated purr for process */
183 unsigned long dabr; /* Data address breakpoint register */
184 #ifdef CONFIG_ALTIVEC
185 /* Complete AltiVec register set */
186 vector128 vr[32] __attribute__((aligned(16)));
188 vector128 vscr __attribute__((aligned(16)));
189 unsigned long vrsave;
190 int used_vr; /* set if process has used altivec */
191 #endif /* CONFIG_ALTIVEC */
194 int used_vsr; /* set if process has used altivec */
195 #endif /* CONFIG_VSX */
197 unsigned long evr[32]; /* upper 32-bits of SPE regs */
198 u64 acc; /* Accumulator */
199 unsigned long spefscr; /* SPE & eFP status */
200 int used_spe; /* set if process has used spe */
201 #endif /* CONFIG_SPE */
204 #define ARCH_MIN_TASKALIGN 16
206 #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
207 #define INIT_SP_LIMIT \
208 (_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack)
212 #define INIT_THREAD { \
214 .ksp_limit = INIT_SP_LIMIT, \
216 .pgdir = swapper_pg_dir, \
217 .fpexc_mode = MSR_FE0 | MSR_FE1, \
220 #define INIT_THREAD { \
222 .ksp_limit = INIT_SP_LIMIT, \
223 .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
226 .fpscr = { .val = 0, }, \
232 * Return saved PC of a blocked thread. For now, this is the "user" PC
234 #define thread_saved_pc(tsk) \
235 ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
237 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.regs)
239 unsigned long get_wchan(struct task_struct *p);
241 #define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
242 #define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
244 /* Get/set floating-point exception mode */
245 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
246 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
248 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
249 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
251 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
252 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
254 extern int get_endian(struct task_struct *tsk, unsigned long adr);
255 extern int set_endian(struct task_struct *tsk, unsigned int val);
257 #define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr))
258 #define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val))
260 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
261 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
263 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
265 return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
268 static inline unsigned long __pack_fe01(unsigned int fpmode)
270 return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
274 #define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0)
276 #define cpu_relax() barrier()
279 /* Check that a certain kernel stack pointer is valid in task_struct p */
280 int validate_sp(unsigned long sp, struct task_struct *p,
281 unsigned long nbytes);
286 #define ARCH_HAS_PREFETCH
287 #define ARCH_HAS_PREFETCHW
288 #define ARCH_HAS_SPINLOCK_PREFETCH
290 static inline void prefetch(const void *x)
295 __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
298 static inline void prefetchw(const void *x)
303 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
306 #define spin_lock_prefetch(x) prefetchw(x)
309 #define HAVE_ARCH_PICK_MMAP_LAYOUT
312 #endif /* __KERNEL__ */
313 #endif /* __ASSEMBLY__ */
314 #endif /* _ASM_POWERPC_PROCESSOR_H */