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Diffstat (limited to 'include/asm-parisc/processor.h')
| -rw-r--r-- | include/asm-parisc/processor.h | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/include/asm-parisc/processor.h b/include/asm-parisc/processor.h new file mode 100644 index 00000000000..0b61f51d846 --- /dev/null +++ b/include/asm-parisc/processor.h @@ -0,0 +1,344 @@ +/* + * include/asm-parisc/processor.h + * + * Copyright (C) 1994 Linus Torvalds + * Copyright (C) 2001 Grant Grundler + */ + +#ifndef __ASM_PARISC_PROCESSOR_H +#define __ASM_PARISC_PROCESSOR_H + +#ifndef __ASSEMBLY__ +#include <linux/config.h> +#include <linux/threads.h> + +#include <asm/hardware.h> +#include <asm/page.h> +#include <asm/pdc.h> +#include <asm/ptrace.h> +#include <asm/types.h> +#include <asm/system.h> +#endif /* __ASSEMBLY__ */ + +#define KERNEL_STACK_SIZE (4*PAGE_SIZE) + +/* + * Default implementation of macro that returns current + * instruction pointer ("program counter"). + */ + +/* We cannot use MFIA as it was added for PA2.0 - prumpf + + At one point there were no "0f/0b" type local symbols in gas for + PA-RISC. This is no longer true, but this still seems like the + nicest way to implement this. */ + +#define current_text_addr() ({ void *pc; __asm__("\n\tblr 0,%0\n\tnop":"=r" (pc)); pc; }) + +#define TASK_SIZE (current->thread.task_size) +#define TASK_UNMAPPED_BASE (current->thread.map_base) + +#define DEFAULT_TASK_SIZE32 (0xFFF00000UL) +#define DEFAULT_MAP_BASE32 (0x40000000UL) + +#ifdef __LP64__ +#define DEFAULT_TASK_SIZE (MAX_ADDRESS-0xf000000) +#define DEFAULT_MAP_BASE (0x200000000UL) +#else +#define DEFAULT_TASK_SIZE DEFAULT_TASK_SIZE32 +#define DEFAULT_MAP_BASE DEFAULT_MAP_BASE32 +#endif + +#ifndef __ASSEMBLY__ + +/* + * Data detected about CPUs at boot time which is the same for all CPU's. + * HP boxes are SMP - ie identical processors. + * + * FIXME: some CPU rev info may be processor specific... + */ +struct system_cpuinfo_parisc { + unsigned int cpu_count; + unsigned int cpu_hz; + unsigned int hversion; + unsigned int sversion; + enum cpu_type cpu_type; + + struct { + struct pdc_model model; + unsigned long versions; + unsigned long cpuid; + unsigned long capabilities; + char sys_model_name[81]; /* PDC-ROM returnes this model name */ + } pdc; + + char *cpu_name; /* e.g. "PA7300LC (PCX-L2)" */ + char *family_name; /* e.g. "1.1e" */ +}; + + +/* Per CPU data structure - ie varies per CPU. */ +struct cpuinfo_parisc { + unsigned long it_value; /* Interval Timer at last timer Intr */ + unsigned long it_delta; /* Interval delta (tic_10ms / HZ * 100) */ + unsigned long irq_count; /* number of IRQ's since boot */ + unsigned long irq_max_cr16; /* longest time to handle a single IRQ */ + unsigned long cpuid; /* aka slot_number or set to NO_PROC_ID */ + unsigned long hpa; /* Host Physical address */ + unsigned long txn_addr; /* MMIO addr of EIR or id_eid */ +#ifdef CONFIG_SMP + spinlock_t lock; /* synchronization for ipi's */ + unsigned long pending_ipi; /* bitmap of type ipi_message_type */ + unsigned long ipi_count; /* number ipi Interrupts */ +#endif + unsigned long bh_count; /* number of times bh was invoked */ + unsigned long prof_counter; /* per CPU profiling support */ + unsigned long prof_multiplier; /* per CPU profiling support */ + unsigned long fp_rev; + unsigned long fp_model; + unsigned int state; + struct parisc_device *dev; + unsigned long loops_per_jiffy; +}; + +extern struct system_cpuinfo_parisc boot_cpu_data; +extern struct cpuinfo_parisc cpu_data[NR_CPUS]; +#define current_cpu_data cpu_data[smp_processor_id()] + +#define CPU_HVERSION ((boot_cpu_data.hversion >> 4) & 0x0FFF) + +typedef struct { + int seg; +} mm_segment_t; + +#define ARCH_MIN_TASKALIGN 8 + +struct thread_struct { + struct pt_regs regs; + unsigned long task_size; + unsigned long map_base; + unsigned long flags; +}; + +/* Thread struct flags. */ +#define PARISC_KERNEL_DEATH (1UL << 31) /* see die_if_kernel()... */ + +#define INIT_THREAD { \ + regs: { gr: { 0, }, \ + fr: { 0, }, \ + sr: { 0, }, \ + iasq: { 0, }, \ + iaoq: { 0, }, \ + cr27: 0, \ + }, \ + task_size: DEFAULT_TASK_SIZE, \ + map_base: DEFAULT_MAP_BASE, \ + flags: 0 \ + } + +/* + * Return saved PC of a blocked thread. This is used by ps mostly. + */ + +unsigned long thread_saved_pc(struct task_struct *t); +void show_trace(struct task_struct *task, unsigned long *stack); + +/* + * Start user thread in another space. + * + * Note that we set both the iaoq and r31 to the new pc. When + * the kernel initially calls execve it will return through an + * rfi path that will use the values in the iaoq. The execve + * syscall path will return through the gateway page, and + * that uses r31 to branch to. + * + * For ELF we clear r23, because the dynamic linker uses it to pass + * the address of the finalizer function. + * + * We also initialize sr3 to an illegal value (illegal for our + * implementation, not for the architecture). + */ +typedef unsigned int elf_caddr_t; + +#define start_thread_som(regs, new_pc, new_sp) do { \ + unsigned long *sp = (unsigned long *)new_sp; \ + __u32 spaceid = (__u32)current->mm->context; \ + unsigned long pc = (unsigned long)new_pc; \ + /* offset pc for priv. level */ \ + pc |= 3; \ + \ + set_fs(USER_DS); \ + regs->iasq[0] = spaceid; \ + regs->iasq[1] = spaceid; \ + regs->iaoq[0] = pc; \ + regs->iaoq[1] = pc + 4; \ + regs->sr[2] = LINUX_GATEWAY_SPACE; \ + regs->sr[3] = 0xffff; \ + regs->sr[4] = spaceid; \ + regs->sr[5] = spaceid; \ + regs->sr[6] = spaceid; \ + regs->sr[7] = spaceid; \ + regs->gr[ 0] = USER_PSW; \ + regs->gr[30] = ((new_sp)+63)&~63; \ + regs->gr[31] = pc; \ + \ + get_user(regs->gr[26],&sp[0]); \ + get_user(regs->gr[25],&sp[-1]); \ + get_user(regs->gr[24],&sp[-2]); \ + get_user(regs->gr[23],&sp[-3]); \ +} while(0) + +/* The ELF abi wants things done a "wee bit" differently than + * som does. Supporting this behavior here avoids + * having our own version of create_elf_tables. + * + * Oh, and yes, that is not a typo, we are really passing argc in r25 + * and argv in r24 (rather than r26 and r25). This is because that's + * where __libc_start_main wants them. + * + * Duplicated from dl-machine.h for the benefit of readers: + * + * Our initial stack layout is rather different from everyone else's + * due to the unique PA-RISC ABI. As far as I know it looks like + * this: + + ----------------------------------- (user startup code creates this frame) + | 32 bytes of magic | + |---------------------------------| + | 32 bytes argument/sp save area | + |---------------------------------| (bprm->p) + | ELF auxiliary info | + | (up to 28 words) | + |---------------------------------| + | NULL | + |---------------------------------| + | Environment pointers | + |---------------------------------| + | NULL | + |---------------------------------| + | Argument pointers | + |---------------------------------| <- argv + | argc (1 word) | + |---------------------------------| <- bprm->exec (HACK!) + | N bytes of slack | + |---------------------------------| + | filename passed to execve | + |---------------------------------| (mm->env_end) + | env strings | + |---------------------------------| (mm->env_start, mm->arg_end) + | arg strings | + |---------------------------------| + | additional faked arg strings if | + | we're invoked via binfmt_script | + |---------------------------------| (mm->arg_start) + stack base is at TASK_SIZE - rlim_max. + +on downward growing arches, it looks like this: + stack base at TASK_SIZE + | filename passed to execve + | env strings + | arg strings + | faked arg strings + | slack + | ELF + | envps + | argvs + | argc + + * The pleasant part of this is that if we need to skip arguments we + * can just decrement argc and move argv, because the stack pointer + * is utterly unrelated to the location of the environment and + * argument vectors. + * + * Note that the S/390 people took the easy way out and hacked their + * GCC to make the stack grow downwards. + * + * Final Note: For entry from syscall, the W (wide) bit of the PSW + * is stuffed into the lowest bit of the user sp (%r30), so we fill + * it in here from the current->personality + */ + +#ifdef __LP64__ +#define USER_WIDE_MODE (personality(current->personality) == PER_LINUX) +#else +#define USER_WIDE_MODE 0 +#endif + +#define start_thread(regs, new_pc, new_sp) do { \ + elf_addr_t *sp = (elf_addr_t *)new_sp; \ + __u32 spaceid = (__u32)current->mm->context; \ + elf_addr_t pc = (elf_addr_t)new_pc | 3; \ + elf_caddr_t *argv = (elf_caddr_t *)bprm->exec + 1; \ + \ + set_fs(USER_DS); \ + regs->iasq[0] = spaceid; \ + regs->iasq[1] = spaceid; \ + regs->iaoq[0] = pc; \ + regs->iaoq[1] = pc + 4; \ + regs->sr[2] = LINUX_GATEWAY_SPACE; \ + regs->sr[3] = 0xffff; \ + regs->sr[4] = spaceid; \ + regs->sr[5] = spaceid; \ + regs->sr[6] = spaceid; \ + regs->sr[7] = spaceid; \ + regs->gr[ 0] = USER_PSW | (USER_WIDE_MODE ? PSW_W : 0); \ + regs->fr[ 0] = 0LL; \ + regs->fr[ 1] = 0LL; \ + regs->fr[ 2] = 0LL; \ + regs->fr[ 3] = 0LL; \ + regs->gr[30] = (((unsigned long)sp + 63) &~ 63) | (USER_WIDE_MODE ? 1 : 0); \ + regs->gr[31] = pc; \ + \ + get_user(regs->gr[25], (argv - 1)); \ + regs->gr[24] = (long) argv; \ + regs->gr[23] = 0; \ +} while(0) + +struct task_struct; +struct mm_struct; + +/* Free all resources held by a thread. */ +extern void release_thread(struct task_struct *); +extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); + +/* Prepare to copy thread state - unlazy all lazy status */ +#define prepare_to_copy(tsk) do { } while (0) + +extern void map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm); + +extern unsigned long get_wchan(struct task_struct *p); + +#define KSTK_EIP(tsk) ((tsk)->thread.regs.iaoq[0]) +#define KSTK_ESP(tsk) ((tsk)->thread.regs.gr[30]) + + +/* + * PA 2.0 defines data prefetch instructions on page 6-11 of the Kane book. + * In addition, many implementations do hardware prefetching of both + * instructions and data. + * + * PA7300LC (page 14-4 of the ERS) also implements prefetching by a load + * to gr0 but not in a way that Linux can use. If the load would cause an + * interruption (eg due to prefetching 0), it is suppressed on PA2.0 + * processors, but not on 7300LC. + */ +#ifdef CONFIG_PREFETCH +#define ARCH_HAS_PREFETCH +#define ARCH_HAS_PREFETCHW + +extern inline void prefetch(const void *addr) +{ + __asm__("ldw 0(%0), %%r0" : : "r" (addr)); +} + +extern inline void prefetchw(const void *addr) +{ + __asm__("ldd 0(%0), %%r0" : : "r" (addr)); +} +#endif + +#define cpu_relax() barrier() + +#endif /* __ASSEMBLY__ */ + +#endif /* __ASM_PARISC_PROCESSOR_H */ |