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 #ifndef CONFIG_PPC_MULTIPLATFORM
58 #endif /* CONFIG_PPC_MULTIPLATFORM */
60 #endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */
63 * Default implementation of macro that returns current
64 * instruction pointer ("program counter").
66 #define current_text_addr() ({ __label__ _l; _l: &&_l;})
68 /* Macros for adjusting thread priority (hardware multi-threading) */
69 #define HMT_very_low() asm volatile("or 31,31,31 # very low priority")
70 #define HMT_low() asm volatile("or 1,1,1 # low priority")
71 #define HMT_medium_low() asm volatile("or 6,6,6 # medium low priority")
72 #define HMT_medium() asm volatile("or 2,2,2 # medium priority")
73 #define HMT_medium_high() asm volatile("or 5,5,5 # medium high priority")
74 #define HMT_high() asm volatile("or 3,3,3 # high priority")
81 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
82 void release_thread(struct task_struct *);
84 /* Prepare to copy thread state - unlazy all lazy status */
85 extern void prepare_to_copy(struct task_struct *tsk);
87 /* Create a new kernel thread. */
88 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
90 /* Lazy FPU handling on uni-processor */
91 extern struct task_struct *last_task_used_math;
92 extern struct task_struct *last_task_used_altivec;
93 extern struct task_struct *last_task_used_spe;
96 #define TASK_SIZE (CONFIG_TASK_SIZE)
98 /* This decides where the kernel will search for a free chunk of vm
99 * space during mmap's.
101 #define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
105 /* 64-bit user address space is 44-bits (16TB user VM) */
106 #define TASK_SIZE_USER64 (0x0000100000000000UL)
109 * 32-bit user address space is 4GB - 1 page
110 * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
112 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
114 #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
115 TASK_SIZE_USER32 : TASK_SIZE_USER64)
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 )
131 struct thread_struct {
132 unsigned long ksp; /* Kernel stack pointer */
134 unsigned long ksp_vsid;
136 struct pt_regs *regs; /* Pointer to saved register state */
137 mm_segment_t fs; /* for get_fs() validation */
139 void *pgdir; /* root of page-table tree */
140 signed long last_syscall;
142 #if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
143 unsigned long dbcr0; /* debug control register values */
146 double fpr[32]; /* Complete floating point set */
147 struct { /* fpr ... fpscr must be contiguous */
150 unsigned int val; /* Floating point status */
152 int fpexc_mode; /* floating-point exception mode */
153 unsigned int align_ctl; /* alignment handling control */
155 unsigned long start_tb; /* Start purr when proc switched in */
156 unsigned long accum_tb; /* Total accumilated purr for process */
158 unsigned long dabr; /* Data address breakpoint register */
159 #ifdef CONFIG_ALTIVEC
160 /* Complete AltiVec register set */
161 vector128 vr[32] __attribute((aligned(16)));
163 vector128 vscr __attribute((aligned(16)));
164 unsigned long vrsave;
165 int used_vr; /* set if process has used altivec */
166 #endif /* CONFIG_ALTIVEC */
168 unsigned long evr[32]; /* upper 32-bits of SPE regs */
169 u64 acc; /* Accumulator */
170 unsigned long spefscr; /* SPE & eFP status */
171 int used_spe; /* set if process has used spe */
172 #endif /* CONFIG_SPE */
175 #define ARCH_MIN_TASKALIGN 16
177 #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
181 #define INIT_THREAD { \
184 .pgdir = swapper_pg_dir, \
185 .fpexc_mode = MSR_FE0 | MSR_FE1, \
188 #define INIT_THREAD { \
190 .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
193 .fpscr = { .val = 0, }, \
199 * Return saved PC of a blocked thread. For now, this is the "user" PC
201 #define thread_saved_pc(tsk) \
202 ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
204 unsigned long get_wchan(struct task_struct *p);
206 #define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
207 #define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
209 /* Get/set floating-point exception mode */
210 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
211 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
213 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
214 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
216 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
217 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
219 extern int get_endian(struct task_struct *tsk, unsigned long adr);
220 extern int set_endian(struct task_struct *tsk, unsigned int val);
222 #define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr))
223 #define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val))
225 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
226 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
228 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
230 return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
233 static inline unsigned long __pack_fe01(unsigned int fpmode)
235 return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
239 #define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0)
241 #define cpu_relax() barrier()
244 /* Check that a certain kernel stack pointer is valid in task_struct p */
245 int validate_sp(unsigned long sp, struct task_struct *p,
246 unsigned long nbytes);
251 #define ARCH_HAS_PREFETCH
252 #define ARCH_HAS_PREFETCHW
253 #define ARCH_HAS_SPINLOCK_PREFETCH
255 static inline void prefetch(const void *x)
260 __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
263 static inline void prefetchw(const void *x)
268 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
271 #define spin_lock_prefetch(x) prefetchw(x)
274 #define HAVE_ARCH_PICK_MMAP_LAYOUT
277 #endif /* __KERNEL__ */
278 #endif /* __ASSEMBLY__ */
279 #endif /* _ASM_POWERPC_PROCESSOR_H */