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/* $OpenBSD: cpu.h,v 1.8 2021/06/29 21:27:52 kettenis Exp $ */
/*
* Copyright (c) 2019 Mike Larkin <mlarkin@openbsd.org>
* Copyright (c) 2016 Dale Rahn <drahn@dalerahn.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _MACHINE_CPU_H_
#define _MACHINE_CPU_H_
/*
* User-visible definitions
*/
/* CTL_MACHDEP definitions. */
#define CPU_COMPATIBLE 1 /* compatible property */
#define CPU_MAXID 2 /* number of valid machdep ids */
#define CTL_MACHDEP_NAMES { \
{ 0, 0 }, \
{ "compatible", CTLTYPE_STRING }, \
}
#ifdef _KERNEL
/*
* Kernel-only definitions
*/
#include <machine/intr.h>
#include <machine/frame.h>
#include <machine/riscvreg.h>
/* All the CLKF_* macros take a struct clockframe * as an argument. */
#define clockframe trapframe
/*
* CLKF_USERMODE: Return TRUE/FALSE (1/0) depending on whether the
* frame came from USR mode or not.
*/
#define CLKF_USERMODE(frame) ((frame->tf_sstatus & SSTATUS_SPP) == 0)
/*
* CLKF_INTR: True if we took the interrupt from inside another
* interrupt handler.
*/
#define CLKF_INTR(frame) (curcpu()->ci_idepth > 1)
/*
* CLKF_PC: Extract the program counter from a clockframe
*/
#define CLKF_PC(frame) (frame->tf_sepc)
/*
* PROC_PC: Find out the program counter for the given process.
*/
#define PROC_PC(p) ((p)->p_addr->u_pcb.pcb_tf->tf_sepc)
#define PROC_STACK(p) ((p)->p_addr->u_pcb.pcb_tf->tf_sp)
#include <sys/device.h>
#include <sys/sched.h>
#include <sys/srp.h>
struct cpu_info {
struct device *ci_dev; /* Device corresponding to this CPU */
struct cpu_info *ci_next;
struct schedstate_percpu ci_schedstate; /* scheduler state */
u_int32_t ci_cpuid;
uint64_t ci_hartid;
int ci_node;
struct cpu_info *ci_self;
struct proc *ci_curproc;
struct pmap *ci_curpm;
struct proc *ci_fpuproc;
u_int32_t ci_randseed;
struct pcb *ci_curpcb;
struct pcb *ci_idle_pcb;
uint64_t ci_lasttb;
uint64_t ci_nexttimerevent;
uint64_t ci_nextstatevent;
int ci_statspending;
uint32_t ci_cpl;
uint32_t ci_ipending;
uint32_t ci_idepth;
#ifdef DIAGNOSTIC
int ci_mutex_level;
#endif
int ci_want_resched;
#ifdef MULTIPROCESSOR
struct srp_hazard ci_srp_hazards[SRP_HAZARD_NUM];
volatile int ci_flags;
uint64_t ci_satp;
vaddr_t ci_initstack_end;
int ci_ipi_reason;
volatile int ci_ddb_paused;
#define CI_DDB_RUNNING 0
#define CI_DDB_SHOULDSTOP 1
#define CI_DDB_STOPPED 2
#define CI_DDB_ENTERDDB 3
#define CI_DDB_INDDB 4
#endif
#ifdef GPROF
struct gmonparam *ci_gmon;
#endif
char ci_panicbuf[512];
};
#define CPUF_PRIMARY (1<<0)
#define CPUF_AP (1<<1)
#define CPUF_IDENTIFY (1<<2)
#define CPUF_IDENTIFIED (1<<3)
#define CPUF_PRESENT (1<<4)
#define CPUF_GO (1<<5)
#define CPUF_RUNNING (1<<6)
static inline struct cpu_info *
curcpu(void)
{
struct cpu_info *__ci = NULL;
__asm __volatile("mv %0, tp" : "=&r"(__ci));
return (__ci);
}
extern uint32_t boot_hart; /* The hart we booted on. */
extern struct cpu_info cpu_info_primary;
extern struct cpu_info *cpu_info_list;
#ifndef MULTIPROCESSOR
#define cpu_number() 0
#define CPU_IS_PRIMARY(ci) 1
#define CPU_IS_RUNNING(ci) 1
#define CPU_INFO_ITERATOR int
#define CPU_INFO_FOREACH(cii, ci) \
for (cii = 0, ci = curcpu(); ci != NULL; ci = NULL)
#define CPU_INFO_UNIT(ci) 0
#define MAXCPUS 1
#define cpu_unidle(ci)
#else
#define cpu_number() (curcpu()->ci_cpuid)
#define CPU_IS_PRIMARY(ci) ((ci) == &cpu_info_primary)
#define CPU_IS_RUNNING(ci) ((ci)->ci_flags & CPUF_RUNNING)
#define CPU_INFO_ITERATOR int
#define CPU_INFO_FOREACH(cii, ci) for (cii = 0, ci = cpu_info_list; \
ci != NULL; ci = ci->ci_next)
#define CPU_INFO_UNIT(ci) ((ci)->ci_dev ? (ci)->ci_dev->dv_unit : 0)
#define MAXCPUS 32
extern struct cpu_info *cpu_info[MAXCPUS];
void cpu_boot_secondary_processors(void);
void cpu_startclock(void);
#endif /* !MULTIPROCESSOR */
#define CPU_BUSY_CYCLE() do {} while (0)
#define curpcb curcpu()->ci_curpcb
static inline unsigned int
cpu_rnd_messybits(void)
{
// Should do bit reversal ^ with csr_read(time);
return csr_read(time);
}
/*
* Scheduling glue
*/
#define aston(p) ((p)->p_md.md_astpending = 1)
#define setsoftast() aston(curcpu()->ci_curproc)
/*
* Notify the current process (p) that it has a signal pending,
* process as soon as possible.
*/
#ifdef MULTIPROCESSOR
void cpu_unidle(struct cpu_info *ci);
#define signotify(p) (aston(p), cpu_unidle((p)->p_cpu))
void cpu_kick(struct cpu_info *);
#else
#define cpu_kick(ci)
#define cpu_unidle(ci)
#define signotify(p) setsoftast()
#endif
/*
* Preempt the current process if in interrupt from user mode,
* or after the current trap/syscall if in system mode.
*/
void need_resched(struct cpu_info *);
#define clear_resched(ci) ((ci)->ci_want_resched = 0)
/*
* Give a profiling tick to the current process when the user profiling
* buffer pages are invalid. On the i386, request an ast to send us
* through trap(), marking the proc as needing a profiling tick.
*/
#define need_proftick(p) aston(p)
// asm code to start new kernel contexts.
void proc_trampoline(void);
void child_trampoline(void);
/*
* Random cruft
*/
void dumpconf(void);
/* cpuswitch.S */
struct pcb;
void savectx (struct pcb *pcb);
static inline void
intr_enable(void)
{
__asm __volatile("csrsi sstatus, %0" :: "i" (SSTATUS_SIE));
}
static inline u_long
intr_disable(void)
{
uint64_t ret;
__asm __volatile(
"csrrci %0, sstatus, %1"
: "=&r" (ret) : "i" (SSTATUS_SIE)
);
return (ret & (SSTATUS_SIE));
}
static inline void
intr_restore(u_long s)
{
__asm __volatile("csrs sstatus, %0" :: "r" (s));
}
void delay (unsigned);
#define DELAY(x) delay(x)
void fpu_save(struct proc *, struct trapframe *);
void fpu_load(struct proc *);
void fpu_discard(struct proc *p);
#endif /* _KERNEL */
#ifdef MULTIPROCESSOR
#include <sys/mplock.h>
#endif /* MULTIPROCESSOR */
#endif /* !_MACHINE_CPU_H_ */
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