2 * Copyright (c) 2014 Andrew Turner
3 * Copyright (c) 2015-2016 Ruslan Bukin <br@bsdpad.com>
6 * Portions of this software were developed by SRI International and the
7 * University of Cambridge Computer Laboratory under DARPA/AFRL contract
8 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
10 * Portions of this software were developed by the University of Cambridge
11 * Computer Laboratory as part of the CTSRD Project, with support from the
12 * UK Higher Education Innovation Fund (HEIF).
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 #include "opt_platform.h"
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include <sys/param.h>
42 #include <sys/systm.h>
48 #include <sys/imgact.h>
50 #include <sys/kernel.h>
51 #include <sys/limits.h>
52 #include <sys/linker.h>
53 #include <sys/msgbuf.h>
56 #include <sys/ptrace.h>
57 #include <sys/reboot.h>
58 #include <sys/rwlock.h>
59 #include <sys/sched.h>
60 #include <sys/signalvar.h>
61 #include <sys/syscallsubr.h>
62 #include <sys/sysent.h>
63 #include <sys/sysproto.h>
64 #include <sys/ucontext.h>
67 #include <vm/vm_kern.h>
68 #include <vm/vm_object.h>
69 #include <vm/vm_page.h>
71 #include <vm/vm_map.h>
72 #include <vm/vm_pager.h>
74 #include <machine/riscvreg.h>
75 #include <machine/cpu.h>
76 #include <machine/kdb.h>
77 #include <machine/machdep.h>
78 #include <machine/pcb.h>
79 #include <machine/reg.h>
80 #include <machine/trap.h>
81 #include <machine/vmparam.h>
82 #include <machine/intr.h>
83 #include <machine/sbi.h>
85 #include <machine/asm.h>
88 #include <machine/fpe.h>
92 #include <dev/fdt/fdt_common.h>
93 #include <dev/ofw/openfirm.h>
96 struct pcpu __pcpu[MAXCPU];
98 static struct trapframe proc0_tf;
100 vm_paddr_t phys_avail[PHYS_AVAIL_SIZE + 2];
101 vm_paddr_t dump_avail[PHYS_AVAIL_SIZE + 2];
108 #define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1))
109 vm_paddr_t physmap[PHYSMAP_SIZE];
112 struct kva_md_info kmi;
114 int64_t dcache_line_size; /* The minimum D cache line size */
115 int64_t icache_line_size; /* The minimum I cache line size */
116 int64_t idcache_line_size; /* The minimum cache line size */
119 extern int *initstack_end;
120 extern memory_block_info memory_info;
124 uintptr_t mcall_trap(uintptr_t mcause, uintptr_t* regs);
127 mcall_trap(uintptr_t mcause, uintptr_t* regs)
134 cpu_startup(void *dummy)
139 vm_ksubmap_init(&kmi);
141 vm_pager_bufferinit();
144 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
147 cpu_idle_wakeup(int cpu)
154 bzero(void *buf, size_t len)
164 fill_regs(struct thread *td, struct reg *regs)
166 struct trapframe *frame;
168 frame = td->td_frame;
169 regs->sepc = frame->tf_sepc;
170 regs->sstatus = frame->tf_sstatus;
171 regs->ra = frame->tf_ra;
172 regs->sp = frame->tf_sp;
173 regs->gp = frame->tf_gp;
174 regs->tp = frame->tf_tp;
176 memcpy(regs->t, frame->tf_t, sizeof(regs->t));
177 memcpy(regs->s, frame->tf_s, sizeof(regs->s));
178 memcpy(regs->a, frame->tf_a, sizeof(regs->a));
184 set_regs(struct thread *td, struct reg *regs)
186 struct trapframe *frame;
188 frame = td->td_frame;
189 frame->tf_sepc = regs->sepc;
190 frame->tf_sstatus = regs->sstatus;
191 frame->tf_ra = regs->ra;
192 frame->tf_sp = regs->sp;
193 frame->tf_gp = regs->gp;
194 frame->tf_tp = regs->tp;
196 memcpy(frame->tf_t, regs->t, sizeof(frame->tf_t));
197 memcpy(frame->tf_s, regs->s, sizeof(frame->tf_s));
198 memcpy(frame->tf_a, regs->a, sizeof(frame->tf_a));
204 fill_fpregs(struct thread *td, struct fpreg *regs)
211 if ((pcb->pcb_fpflags & PCB_FP_STARTED) != 0) {
213 * If we have just been running FPE instructions we will
214 * need to save the state to memcpy it below.
218 memcpy(regs->fp_x, pcb->pcb_x, sizeof(regs->fp_x));
219 regs->fp_fcsr = pcb->pcb_fcsr;
222 memset(regs->fp_x, 0, sizeof(regs->fp_x));
228 set_fpregs(struct thread *td, struct fpreg *regs)
235 memcpy(pcb->pcb_x, regs->fp_x, sizeof(regs->fp_x));
236 pcb->pcb_fcsr = regs->fp_fcsr;
243 fill_dbregs(struct thread *td, struct dbreg *regs)
246 panic("fill_dbregs");
250 set_dbregs(struct thread *td, struct dbreg *regs)
257 ptrace_set_pc(struct thread *td, u_long addr)
260 panic("ptrace_set_pc");
265 ptrace_single_step(struct thread *td)
273 ptrace_clear_single_step(struct thread *td)
281 exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
283 struct trapframe *tf;
289 memset(tf, 0, sizeof(struct trapframe));
292 * We need to set a0 for init as it doesn't call
293 * cpu_set_syscall_retval to copy the value. We also
294 * need to set td_retval for the cases where we do.
296 tf->tf_a[0] = td->td_retval[0] = stack;
297 tf->tf_sp = STACKALIGN(stack);
298 tf->tf_ra = imgp->entry_addr;
299 tf->tf_sepc = imgp->entry_addr;
301 pcb->pcb_fpflags &= ~PCB_FP_STARTED;
304 /* Sanity check these are the same size, they will be memcpy'd to and fro */
305 CTASSERT(sizeof(((struct trapframe *)0)->tf_a) ==
306 sizeof((struct gpregs *)0)->gp_a);
307 CTASSERT(sizeof(((struct trapframe *)0)->tf_s) ==
308 sizeof((struct gpregs *)0)->gp_s);
309 CTASSERT(sizeof(((struct trapframe *)0)->tf_t) ==
310 sizeof((struct gpregs *)0)->gp_t);
311 CTASSERT(sizeof(((struct trapframe *)0)->tf_a) ==
312 sizeof((struct reg *)0)->a);
313 CTASSERT(sizeof(((struct trapframe *)0)->tf_s) ==
314 sizeof((struct reg *)0)->s);
315 CTASSERT(sizeof(((struct trapframe *)0)->tf_t) ==
316 sizeof((struct reg *)0)->t);
319 get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
321 struct trapframe *tf = td->td_frame;
323 memcpy(mcp->mc_gpregs.gp_t, tf->tf_t, sizeof(mcp->mc_gpregs.gp_t));
324 memcpy(mcp->mc_gpregs.gp_s, tf->tf_s, sizeof(mcp->mc_gpregs.gp_s));
325 memcpy(mcp->mc_gpregs.gp_a, tf->tf_a, sizeof(mcp->mc_gpregs.gp_a));
327 if (clear_ret & GET_MC_CLEAR_RET) {
328 mcp->mc_gpregs.gp_a[0] = 0;
329 mcp->mc_gpregs.gp_t[0] = 0; /* clear syscall error */
332 mcp->mc_gpregs.gp_ra = tf->tf_ra;
333 mcp->mc_gpregs.gp_sp = tf->tf_sp;
334 mcp->mc_gpregs.gp_gp = tf->tf_gp;
335 mcp->mc_gpregs.gp_tp = tf->tf_tp;
336 mcp->mc_gpregs.gp_sepc = tf->tf_sepc;
337 mcp->mc_gpregs.gp_sstatus = tf->tf_sstatus;
343 set_mcontext(struct thread *td, mcontext_t *mcp)
345 struct trapframe *tf;
349 memcpy(tf->tf_t, mcp->mc_gpregs.gp_t, sizeof(tf->tf_t));
350 memcpy(tf->tf_s, mcp->mc_gpregs.gp_s, sizeof(tf->tf_s));
351 memcpy(tf->tf_a, mcp->mc_gpregs.gp_a, sizeof(tf->tf_a));
353 tf->tf_ra = mcp->mc_gpregs.gp_ra;
354 tf->tf_sp = mcp->mc_gpregs.gp_sp;
355 tf->tf_gp = mcp->mc_gpregs.gp_gp;
356 tf->tf_tp = mcp->mc_gpregs.gp_tp;
357 tf->tf_sepc = mcp->mc_gpregs.gp_sepc;
358 tf->tf_sstatus = mcp->mc_gpregs.gp_sstatus;
364 get_fpcontext(struct thread *td, mcontext_t *mcp)
371 curpcb = curthread->td_pcb;
373 KASSERT(td->td_pcb == curpcb, ("Invalid fpe pcb"));
375 if ((curpcb->pcb_fpflags & PCB_FP_STARTED) != 0) {
377 * If we have just been running FPE instructions we will
378 * need to save the state to memcpy it below.
382 KASSERT((curpcb->pcb_fpflags & ~PCB_FP_USERMASK) == 0,
383 ("Non-userspace FPE flags set in get_fpcontext"));
384 memcpy(mcp->mc_fpregs.fp_x, curpcb->pcb_x,
385 sizeof(mcp->mc_fpregs));
386 mcp->mc_fpregs.fp_fcsr = curpcb->pcb_fcsr;
387 mcp->mc_fpregs.fp_flags = curpcb->pcb_fpflags;
388 mcp->mc_flags |= _MC_FP_VALID;
396 set_fpcontext(struct thread *td, mcontext_t *mcp)
403 if ((mcp->mc_flags & _MC_FP_VALID) != 0) {
404 curpcb = curthread->td_pcb;
405 /* FPE usage is enabled, override registers. */
406 memcpy(curpcb->pcb_x, mcp->mc_fpregs.fp_x,
407 sizeof(mcp->mc_fpregs));
408 curpcb->pcb_fcsr = mcp->mc_fpregs.fp_fcsr;
409 curpcb->pcb_fpflags = mcp->mc_fpregs.fp_flags & PCB_FP_USERMASK;
423 if (!sched_runnable())
440 * Flush the D-cache for non-DMA I/O so that the I-cache can
441 * be made coherent later.
444 cpu_flush_dcache(void *ptr, size_t len)
450 /* Get current clock frequency for the given CPU ID. */
452 cpu_est_clockrate(int cpu_id, uint64_t *rate)
455 panic("cpu_est_clockrate");
459 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
469 if (td->td_md.md_spinlock_count == 0) {
470 td->td_md.md_spinlock_count = 1;
471 td->td_md.md_saved_sstatus_ie = intr_disable();
473 td->td_md.md_spinlock_count++;
481 register_t sstatus_ie;
485 sstatus_ie = td->td_md.md_saved_sstatus_ie;
486 td->td_md.md_spinlock_count--;
487 if (td->td_md.md_spinlock_count == 0)
488 intr_restore(sstatus_ie);
491 #ifndef _SYS_SYSPROTO_H_
492 struct sigreturn_args {
498 sys_sigreturn(struct thread *td, struct sigreturn_args *uap)
506 if (copyin(uap->sigcntxp, &uc, sizeof(uc)))
510 * Make sure the processor mode has not been tampered with and
511 * interrupts have not been disabled.
512 * Supervisor interrupts in user mode are always enabled.
514 sstatus = uc.uc_mcontext.mc_gpregs.gp_sstatus;
515 if ((sstatus & SSTATUS_SPP) != 0)
518 error = set_mcontext(td, &uc.uc_mcontext);
522 set_fpcontext(td, &uc.uc_mcontext);
524 /* Restore signal mask. */
525 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
527 return (EJUSTRETURN);
531 * Construct a PCB from a trapframe. This is called from kdb_trap() where
532 * we want to start a backtrace from the function that caused us to enter
533 * the debugger. We have the context in the trapframe, but base the trace
534 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
535 * enough for a backtrace.
538 makectx(struct trapframe *tf, struct pcb *pcb)
541 memcpy(pcb->pcb_t, tf->tf_t, sizeof(tf->tf_t));
542 memcpy(pcb->pcb_s, tf->tf_s, sizeof(tf->tf_s));
543 memcpy(pcb->pcb_a, tf->tf_a, sizeof(tf->tf_a));
545 pcb->pcb_ra = tf->tf_ra;
546 pcb->pcb_sp = tf->tf_sp;
547 pcb->pcb_gp = tf->tf_gp;
548 pcb->pcb_tp = tf->tf_tp;
549 pcb->pcb_sepc = tf->tf_sepc;
553 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
555 struct sigframe *fp, frame;
556 struct sysentvec *sysent;
557 struct trapframe *tf;
567 PROC_LOCK_ASSERT(p, MA_OWNED);
569 sig = ksi->ksi_signo;
570 code = ksi->ksi_code;
572 mtx_assert(&psp->ps_mtx, MA_OWNED);
575 onstack = sigonstack(tf->tf_sp);
577 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
580 /* Allocate and validate space for the signal handler context. */
581 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !onstack &&
582 SIGISMEMBER(psp->ps_sigonstack, sig)) {
583 fp = (struct sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
584 td->td_sigstk.ss_size);
586 fp = (struct sigframe *)td->td_frame->tf_sp;
589 /* Make room, keeping the stack aligned */
591 fp = (struct sigframe *)STACKALIGN(fp);
593 /* Fill in the frame to copy out */
594 get_mcontext(td, &frame.sf_uc.uc_mcontext, 0);
595 get_fpcontext(td, &frame.sf_uc.uc_mcontext);
596 frame.sf_si = ksi->ksi_info;
597 frame.sf_uc.uc_sigmask = *mask;
598 frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) ?
599 ((onstack) ? SS_ONSTACK : 0) : SS_DISABLE;
600 frame.sf_uc.uc_stack = td->td_sigstk;
601 mtx_unlock(&psp->ps_mtx);
602 PROC_UNLOCK(td->td_proc);
604 /* Copy the sigframe out to the user's stack. */
605 if (copyout(&frame, fp, sizeof(*fp)) != 0) {
606 /* Process has trashed its stack. Kill it. */
607 CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp);
613 tf->tf_a[1] = (register_t)&fp->sf_si;
614 tf->tf_a[2] = (register_t)&fp->sf_uc;
616 tf->tf_sepc = (register_t)catcher;
617 tf->tf_sp = (register_t)fp;
619 sysent = p->p_sysent;
620 if (sysent->sv_sigcode_base != 0)
621 tf->tf_ra = (register_t)sysent->sv_sigcode_base;
623 tf->tf_ra = (register_t)(sysent->sv_psstrings -
624 *(sysent->sv_szsigcode));
626 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_sepc,
630 mtx_lock(&psp->ps_mtx);
634 init_proc0(vm_offset_t kstack)
639 proc_linkup0(&proc0, &thread0);
640 thread0.td_kstack = kstack;
641 thread0.td_pcb = (struct pcb *)(thread0.td_kstack) - 1;
642 thread0.td_pcb->pcb_fpflags = 0;
643 thread0.td_frame = &proc0_tf;
644 pcpup->pc_curpcb = thread0.td_pcb;
648 add_physmap_entry(uint64_t base, uint64_t length, vm_paddr_t *physmap,
651 u_int i, insert_idx, _physmap_idx;
653 _physmap_idx = *physmap_idxp;
659 * Find insertion point while checking for overlap. Start off by
660 * assuming the new entry will be added to the end.
662 insert_idx = _physmap_idx;
663 for (i = 0; i <= _physmap_idx; i += 2) {
664 if (base < physmap[i + 1]) {
665 if (base + length <= physmap[i]) {
669 if (boothowto & RB_VERBOSE)
671 "Overlapping memory regions, ignoring second region\n");
676 /* See if we can prepend to the next entry. */
677 if (insert_idx <= _physmap_idx &&
678 base + length == physmap[insert_idx]) {
679 physmap[insert_idx] = base;
683 /* See if we can append to the previous entry. */
684 if (insert_idx > 0 && base == physmap[insert_idx - 1]) {
685 physmap[insert_idx - 1] += length;
690 *physmap_idxp = _physmap_idx;
691 if (_physmap_idx == PHYSMAP_SIZE) {
693 "Too many segments in the physical address map, giving up\n");
698 * Move the last 'N' entries down to make room for the new
701 for (i = _physmap_idx; i > insert_idx; i -= 2) {
702 physmap[i] = physmap[i - 2];
703 physmap[i + 1] = physmap[i - 1];
706 /* Insert the new entry. */
707 physmap[insert_idx] = base;
708 physmap[insert_idx + 1] = base + length;
710 printf("physmap[%d] = 0x%016lx\n", insert_idx, base);
711 printf("physmap[%d] = 0x%016lx\n", insert_idx + 1, base + length);
717 try_load_dtb(caddr_t kmdp)
721 dtbp = (vm_offset_t)&fdt_static_dtb;
722 if (dtbp == (vm_offset_t)NULL) {
723 printf("ERROR loading DTB\n");
727 if (OF_install(OFW_FDT, 0) == FALSE)
728 panic("Cannot install FDT");
730 if (OF_init((void *)dtbp) != 0)
731 panic("OF_init failed with the found device tree");
743 * Fake up a boot descriptor table.
744 * RISCVTODO: This needs to be done via loader (when it's available).
747 fake_preload_metadata(struct riscv_bootparams *rvbp __unused)
750 vm_offset_t zstart = 0, zend = 0;
752 vm_offset_t lastaddr;
754 static uint32_t fake_preload[35];
756 fake_preload[i++] = MODINFO_NAME;
757 fake_preload[i++] = strlen("kernel") + 1;
758 strcpy((char*)&fake_preload[i++], "kernel");
760 fake_preload[i++] = MODINFO_TYPE;
761 fake_preload[i++] = strlen("elf64 kernel") + 1;
762 strcpy((char*)&fake_preload[i++], "elf64 kernel");
764 fake_preload[i++] = MODINFO_ADDR;
765 fake_preload[i++] = sizeof(vm_offset_t);
766 fake_preload[i++] = (uint64_t)(KERNBASE + KERNENTRY);
768 fake_preload[i++] = MODINFO_SIZE;
769 fake_preload[i++] = sizeof(uint64_t);
770 printf("end is 0x%016lx\n", (uint64_t)&end);
771 fake_preload[i++] = (uint64_t)&end - (uint64_t)(KERNBASE + KERNENTRY);
776 if (*(uint32_t *)KERNVIRTADDR == MAGIC_TRAMP_NUMBER) {
777 fake_preload[i++] = MODINFO_METADATA|MODINFOMD_SSYM;
778 fake_preload[i++] = sizeof(vm_offset_t);
779 fake_preload[i++] = *(uint32_t *)(KERNVIRTADDR + 4);
780 fake_preload[i++] = MODINFO_METADATA|MODINFOMD_ESYM;
781 fake_preload[i++] = sizeof(vm_offset_t);
782 fake_preload[i++] = *(uint32_t *)(KERNVIRTADDR + 8);
783 lastaddr = *(uint32_t *)(KERNVIRTADDR + 8);
785 zstart = *(uint32_t *)(KERNVIRTADDR + 4);
786 db_fetch_ksymtab(zstart, zend);
790 lastaddr = (vm_offset_t)&end;
791 fake_preload[i++] = 0;
793 preload_metadata = (void *)fake_preload;
799 initriscv(struct riscv_bootparams *rvbp)
801 vm_offset_t lastaddr;
805 /* Set the module data location */
806 lastaddr = fake_preload_metadata(rvbp);
808 /* Find the kernel address */
809 kmdp = preload_search_by_type("elf kernel");
811 kmdp = preload_search_by_type("elf64 kernel");
813 boothowto = RB_VERBOSE | RB_SINGLE;
814 boothowto = RB_VERBOSE;
822 /* Load the physical memory ranges */
826 struct mem_region mem_regions[FDT_MEM_REGIONS];
829 /* Grab physical memory regions information from device tree. */
830 if (fdt_get_mem_regions(mem_regions, &mem_regions_sz, NULL) != 0)
831 panic("Cannot get physical memory regions");
832 for (i = 0; i < mem_regions_sz; i++)
833 add_physmap_entry(mem_regions[i].mr_start,
834 mem_regions[i].mr_size, physmap, &physmap_idx);
837 add_physmap_entry(memory_info.base, memory_info.size,
838 physmap, &physmap_idx);
840 /* Set the pcpu data, this is needed by pmap_bootstrap */
842 pcpu_init(pcpup, 0, sizeof(struct pcpu));
844 /* Set the pcpu pointer */
845 __asm __volatile("mv gp, %0" :: "r"(pcpup));
847 PCPU_SET(curthread, &thread0);
849 /* Do basic tuning, hz etc */
854 /* Bootstrap enough of pmap to enter the kernel proper */
855 kernlen = (lastaddr - KERNBASE);
856 pmap_bootstrap(rvbp->kern_l1pt, memory_info.base, kernlen);
860 init_proc0(rvbp->kern_stack);
862 /* set page table base register for thread0 */
863 thread0.td_pcb->pcb_l1addr = \
864 (rvbp->kern_l1pt - KERNBASE + memory_info.base);
866 msgbufinit(msgbufp, msgbufsize);
868 init_param2(physmem);
871 riscv_init_interrupts();