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.
13 #include <linux/config.h>
17 #include <linux/compiler.h>
18 #include <asm/ptrace.h>
19 #include <asm/types.h>
21 /* We do _not_ want to define new machine types at all, those must die
22 * in favor of using the device-tree
26 /* Platforms codes (to be obsoleted) */
27 #define PLATFORM_PSERIES 0x0100
28 #define PLATFORM_PSERIES_LPAR 0x0101
29 #define PLATFORM_ISERIES_LPAR 0x0201
30 #define PLATFORM_LPAR 0x0001
31 #define PLATFORM_POWERMAC 0x0400
32 #define PLATFORM_MAPLE 0x0500
33 #define PLATFORM_PREP 0x0600
34 #define PLATFORM_CHRP 0x0700
35 #define PLATFORM_CELL 0x1000
37 /* Compat platform codes for 32 bits */
38 #define _MACH_prep PLATFORM_PREP
39 #define _MACH_Pmac PLATFORM_POWERMAC
40 #define _MACH_chrp PLATFORM_CHRP
42 /* PREP sub-platform types see residual.h for these */
43 #define _PREP_Motorola 0x01 /* motorola prep */
44 #define _PREP_Firm 0x02 /* firmworks prep */
45 #define _PREP_IBM 0x00 /* ibm prep */
46 #define _PREP_Bull 0x03 /* bull prep */
48 /* CHRP sub-platform types. These are arbitrary */
49 #define _CHRP_Motorola 0x04 /* motorola chrp, the cobra */
50 #define _CHRP_IBM 0x05 /* IBM chrp, the longtrail and longtrail 2 */
51 #define _CHRP_Pegasos 0x06 /* Genesi/bplan's Pegasos and Pegasos2 */
53 #define platform_is_pseries() (_machine == PLATFORM_PSERIES || \
54 _machine == PLATFORM_PSERIES_LPAR)
55 #define platform_is_lpar() (!!(_machine & PLATFORM_LPAR))
57 #if defined(CONFIG_PPC_MULTIPLATFORM)
62 /* what kind of prep workstation we are */
63 extern int _prep_type;
64 extern int _chrp_type;
67 * This is used to identify the board type from a given PReP board
68 * vendor. Board revision is also made available. This will be moved
71 extern unsigned char ucSystemType;
72 extern unsigned char ucBoardRev;
73 extern unsigned char ucBoardRevMaj, ucBoardRevMin;
75 #endif /* CONFIG_PPC32 */
77 #elif defined(CONFIG_PPC_ISERIES)
79 * iSeries is soon to become MULTIPLATFORM hopefully ...
81 #define _machine CONFIG_PPC_ISERIES_LPAR
84 #endif /* CONFIG_PPC_MULTIPLATFORM */
90 * Default implementation of macro that returns current
91 * instruction pointer ("program counter").
93 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
95 /* Macros for adjusting thread priority (hardware multi-threading) */
96 #define HMT_very_low() asm volatile("or 31,31,31 # very low priority")
97 #define HMT_low() asm volatile("or 1,1,1 # low priority")
98 #define HMT_medium_low() asm volatile("or 6,6,6 # medium low priority")
99 #define HMT_medium() asm volatile("or 2,2,2 # medium priority")
100 #define HMT_medium_high() asm volatile("or 5,5,5 # medium high priority")
101 #define HMT_high() asm volatile("or 3,3,3 # high priority")
108 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
109 void release_thread(struct task_struct *);
111 /* Prepare to copy thread state - unlazy all lazy status */
112 extern void prepare_to_copy(struct task_struct *tsk);
114 /* Create a new kernel thread. */
115 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
117 /* Lazy FPU handling on uni-processor */
118 extern struct task_struct *last_task_used_math;
119 extern struct task_struct *last_task_used_altivec;
120 extern struct task_struct *last_task_used_spe;
123 #define TASK_SIZE (CONFIG_TASK_SIZE)
125 /* This decides where the kernel will search for a free chunk of vm
126 * space during mmap's.
128 #define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
132 /* 64-bit user address space is 44-bits (16TB user VM) */
133 #define TASK_SIZE_USER64 (0x0000100000000000UL)
136 * 32-bit user address space is 4GB - 1 page
137 * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
139 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
141 #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
142 TASK_SIZE_USER32 : TASK_SIZE_USER64)
144 /* This decides where the kernel will search for a free chunk of vm
145 * space during mmap's.
147 #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
148 #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
150 #define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
151 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
158 struct thread_struct {
159 unsigned long ksp; /* Kernel stack pointer */
161 unsigned long ksp_vsid;
163 struct pt_regs *regs; /* Pointer to saved register state */
164 mm_segment_t fs; /* for get_fs() validation */
166 void *pgdir; /* root of page-table tree */
167 signed long last_syscall;
169 #if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
170 unsigned long dbcr0; /* debug control register values */
173 double fpr[32]; /* Complete floating point set */
174 struct { /* fpr ... fpscr must be contiguous */
177 unsigned int val; /* Floating point status */
179 int fpexc_mode; /* floating-point exception mode */
181 unsigned long start_tb; /* Start purr when proc switched in */
182 unsigned long accum_tb; /* Total accumilated purr for process */
183 unsigned long vdso_base; /* base of the vDSO library */
185 unsigned long dabr; /* Data address breakpoint register */
186 #ifdef CONFIG_ALTIVEC
187 /* Complete AltiVec register set */
188 vector128 vr[32] __attribute((aligned(16)));
190 vector128 vscr __attribute((aligned(16)));
191 unsigned long vrsave;
192 int used_vr; /* set if process has used altivec */
193 #endif /* CONFIG_ALTIVEC */
195 unsigned long evr[32]; /* upper 32-bits of SPE regs */
196 u64 acc; /* Accumulator */
197 unsigned long spefscr; /* SPE & eFP status */
198 int used_spe; /* set if process has used spe */
199 #endif /* CONFIG_SPE */
202 #define ARCH_MIN_TASKALIGN 16
204 #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
208 #define INIT_THREAD { \
211 .pgdir = swapper_pg_dir, \
212 .fpexc_mode = MSR_FE0 | MSR_FE1, \
215 #define INIT_THREAD { \
217 .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
220 .fpscr = { .val = 0, }, \
221 .fpexc_mode = MSR_FE0|MSR_FE1, \
226 * Return saved PC of a blocked thread. For now, this is the "user" PC
228 #define thread_saved_pc(tsk) \
229 ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
231 unsigned long get_wchan(struct task_struct *p);
233 #define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
234 #define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
236 /* Get/set floating-point exception mode */
237 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
238 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
240 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
241 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
243 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
245 return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
248 static inline unsigned long __pack_fe01(unsigned int fpmode)
250 return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
254 #define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0)
256 #define cpu_relax() barrier()
262 #define ARCH_HAS_PREFETCH
263 #define ARCH_HAS_PREFETCHW
264 #define ARCH_HAS_SPINLOCK_PREFETCH
266 static inline void prefetch(const void *x)
271 __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
274 static inline void prefetchw(const void *x)
279 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
282 #define spin_lock_prefetch(x) prefetchw(x)
285 #define HAVE_ARCH_PICK_MMAP_LAYOUT
288 #endif /* __KERNEL__ */
289 #endif /* __ASSEMBLY__ */
290 #endif /* _ASM_POWERPC_PROCESSOR_H */