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")
73 void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
74 void release_thread(struct task_struct *);
76 /* Prepare to copy thread state - unlazy all lazy status */
77 extern void prepare_to_copy(struct task_struct *tsk);
79 /* Create a new kernel thread. */
80 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
82 /* Lazy FPU handling on uni-processor */
83 extern struct task_struct *last_task_used_math;
84 extern struct task_struct *last_task_used_altivec;
85 extern struct task_struct *last_task_used_vsx;
86 extern struct task_struct *last_task_used_spe;
90 #if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
91 #error User TASK_SIZE overlaps with KERNEL_START address
93 #define TASK_SIZE (CONFIG_TASK_SIZE)
95 /* This decides where the kernel will search for a free chunk of vm
96 * space during mmap's.
98 #define TASK_UNMAPPED_BASE (TASK_SIZE / 8 * 3)
102 /* 64-bit user address space is 44-bits (16TB user VM) */
103 #define TASK_SIZE_USER64 (0x0000100000000000UL)
106 * 32-bit user address space is 4GB - 1 page
107 * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
109 #define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))
111 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
112 TASK_SIZE_USER32 : TASK_SIZE_USER64)
113 #define TASK_SIZE TASK_SIZE_OF(current)
115 /* This decides where the kernel will search for a free chunk of vm
116 * space during mmap's.
118 #define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
119 #define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))
121 #define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
122 TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
128 #define STACK_TOP_USER64 TASK_SIZE_USER64
129 #define STACK_TOP_USER32 TASK_SIZE_USER32
131 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
132 STACK_TOP_USER32 : STACK_TOP_USER64)
134 #define STACK_TOP_MAX STACK_TOP_USER64
136 #else /* __powerpc64__ */
138 #define STACK_TOP TASK_SIZE
139 #define STACK_TOP_MAX STACK_TOP
141 #endif /* __powerpc64__ */
142 #endif /* __KERNEL__ */
148 #define TS_FPROFFSET 0
149 #define TS_VSRLOWOFFSET 1
150 #define TS_FPR(i) fpr[i][TS_FPROFFSET]
152 struct thread_struct {
153 unsigned long ksp; /* Kernel stack pointer */
154 unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */
157 unsigned long ksp_vsid;
159 struct pt_regs *regs; /* Pointer to saved register state */
160 mm_segment_t fs; /* for get_fs() validation */
162 void *pgdir; /* root of page-table tree */
164 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
166 * The following help to manage the use of Debug Control Registers
167 * om the BookE platforms.
175 * The stored value of the DBSR register will be the value at the
176 * last debug interrupt. This register can only be read from the
177 * user (will never be written to) and has value while helping to
178 * describe the reason for the last debug trap. Torez
182 * The following will contain addresses used by debug applications
183 * to help trace and trap on particular address locations.
184 * The bits in the Debug Control Registers above help define which
185 * of the following registers will contain valid data and/or addresses.
189 #if CONFIG_PPC_ADV_DEBUG_IACS > 2
195 #if CONFIG_PPC_ADV_DEBUG_DVCS > 0
200 /* FP and VSX 0-31 register set */
201 double fpr[32][TS_FPRWIDTH];
205 unsigned int val; /* Floating point status */
207 int fpexc_mode; /* floating-point exception mode */
208 unsigned int align_ctl; /* alignment handling control */
210 unsigned long start_tb; /* Start purr when proc switched in */
211 unsigned long accum_tb; /* Total accumilated purr for process */
213 unsigned long dabr; /* Data address breakpoint register */
214 #ifdef CONFIG_ALTIVEC
215 /* Complete AltiVec register set */
216 vector128 vr[32] __attribute__((aligned(16)));
218 vector128 vscr __attribute__((aligned(16)));
219 unsigned long vrsave;
220 int used_vr; /* set if process has used altivec */
221 #endif /* CONFIG_ALTIVEC */
224 int used_vsr; /* set if process has used altivec */
225 #endif /* CONFIG_VSX */
227 unsigned long evr[32]; /* upper 32-bits of SPE regs */
228 u64 acc; /* Accumulator */
229 unsigned long spefscr; /* SPE & eFP status */
230 int used_spe; /* set if process has used spe */
231 #endif /* CONFIG_SPE */
232 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
233 void* kvm_shadow_vcpu; /* KVM internal data */
234 #endif /* CONFIG_KVM_BOOK3S_32_HANDLER */
237 #define ARCH_MIN_TASKALIGN 16
239 #define INIT_SP (sizeof(init_stack) + (unsigned long) &init_stack)
240 #define INIT_SP_LIMIT \
241 (_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack)
244 #define SPEFSCR_INIT .spefscr = SPEFSCR_FINVE | SPEFSCR_FDBZE | SPEFSCR_FUNFE | SPEFSCR_FOVFE,
250 #define INIT_THREAD { \
252 .ksp_limit = INIT_SP_LIMIT, \
254 .pgdir = swapper_pg_dir, \
255 .fpexc_mode = MSR_FE0 | MSR_FE1, \
259 #define INIT_THREAD { \
261 .ksp_limit = INIT_SP_LIMIT, \
262 .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
265 .fpscr = { .val = 0, }, \
271 * Return saved PC of a blocked thread. For now, this is the "user" PC
273 #define thread_saved_pc(tsk) \
274 ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
276 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.regs)
278 unsigned long get_wchan(struct task_struct *p);
280 #define KSTK_EIP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
281 #define KSTK_ESP(tsk) ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
283 /* Get/set floating-point exception mode */
284 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
285 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
287 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
288 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
290 #define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
291 #define SET_ENDIAN(tsk, val) set_endian((tsk), (val))
293 extern int get_endian(struct task_struct *tsk, unsigned long adr);
294 extern int set_endian(struct task_struct *tsk, unsigned int val);
296 #define GET_UNALIGN_CTL(tsk, adr) get_unalign_ctl((tsk), (adr))
297 #define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val))
299 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
300 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
302 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
304 return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
307 static inline unsigned long __pack_fe01(unsigned int fpmode)
309 return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
313 #define cpu_relax() do { HMT_low(); HMT_medium(); barrier(); } while (0)
315 #define cpu_relax() barrier()
318 /* Check that a certain kernel stack pointer is valid in task_struct p */
319 int validate_sp(unsigned long sp, struct task_struct *p,
320 unsigned long nbytes);
325 #define ARCH_HAS_PREFETCH
326 #define ARCH_HAS_PREFETCHW
327 #define ARCH_HAS_SPINLOCK_PREFETCH
329 static inline void prefetch(const void *x)
334 __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
337 static inline void prefetchw(const void *x)
342 __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
345 #define spin_lock_prefetch(x) prefetchw(x)
348 #define HAVE_ARCH_PICK_MMAP_LAYOUT
352 static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32)
357 sp = regs->gpr[1] & 0x0ffffffffUL;
364 static inline unsigned long get_clean_sp(struct pt_regs *regs, int is_32)
370 #endif /* __KERNEL__ */
371 #endif /* __ASSEMBLY__ */
372 #endif /* _ASM_POWERPC_PROCESSOR_H */