2 * Copyright (c) 2014 Andrew Turner
3 * Copyright (c) 2015-2017 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>
47 #include <sys/devmap.h>
49 #include <sys/imgact.h>
51 #include <sys/kernel.h>
53 #include <sys/limits.h>
54 #include <sys/linker.h>
55 #include <sys/msgbuf.h>
57 #include <sys/physmem.h>
59 #include <sys/ptrace.h>
60 #include <sys/reboot.h>
61 #include <sys/rwlock.h>
62 #include <sys/sched.h>
63 #include <sys/signalvar.h>
64 #include <sys/syscallsubr.h>
65 #include <sys/sysent.h>
66 #include <sys/sysproto.h>
67 #include <sys/tslog.h>
68 #include <sys/ucontext.h>
69 #include <sys/vmmeter.h>
72 #include <vm/vm_param.h>
73 #include <vm/vm_kern.h>
74 #include <vm/vm_object.h>
75 #include <vm/vm_page.h>
76 #include <vm/vm_phys.h>
78 #include <vm/vm_map.h>
79 #include <vm/vm_pager.h>
81 #include <machine/cpu.h>
82 #include <machine/intr.h>
83 #include <machine/kdb.h>
84 #include <machine/machdep.h>
85 #include <machine/metadata.h>
86 #include <machine/pcb.h>
87 #include <machine/pte.h>
88 #include <machine/reg.h>
89 #include <machine/riscvreg.h>
90 #include <machine/sbi.h>
91 #include <machine/trap.h>
92 #include <machine/vmparam.h>
95 #include <machine/fpe.h>
99 #include <contrib/libfdt/libfdt.h>
100 #include <dev/fdt/fdt_common.h>
101 #include <dev/ofw/openfirm.h>
104 static void get_fpcontext(struct thread *td, mcontext_t *mcp);
105 static void set_fpcontext(struct thread *td, mcontext_t *mcp);
107 struct pcpu __pcpu[MAXCPU];
109 static struct trapframe proc0_tf;
114 #define DTB_SIZE_MAX (1024 * 1024)
116 vm_paddr_t physmap[PHYS_AVAIL_ENTRIES];
119 struct kva_md_info kmi;
121 int64_t dcache_line_size; /* The minimum D cache line size */
122 int64_t icache_line_size; /* The minimum I cache line size */
123 int64_t idcache_line_size; /* The minimum cache line size */
125 #define BOOT_HART_INVALID 0xffffffff
126 uint32_t boot_hart = BOOT_HART_INVALID; /* The hart we booted on. */
133 cpu_startup(void *dummy)
139 printf("real memory = %ju (%ju MB)\n", ptoa((uintmax_t)realmem),
140 ptoa((uintmax_t)realmem) / (1024 * 1024));
143 * Display any holes after the first chunk of extended memory.
148 printf("Physical memory chunk(s):\n");
149 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
152 size = phys_avail[indx + 1] - phys_avail[indx];
154 "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n",
155 (uintmax_t)phys_avail[indx],
156 (uintmax_t)phys_avail[indx + 1] - 1,
157 (uintmax_t)size, (uintmax_t)size / PAGE_SIZE);
161 vm_ksubmap_init(&kmi);
163 printf("avail memory = %ju (%ju MB)\n",
164 ptoa((uintmax_t)vm_free_count()),
165 ptoa((uintmax_t)vm_free_count()) / (1024 * 1024));
167 devmap_print_table();
170 vm_pager_bufferinit();
173 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
176 cpu_idle_wakeup(int cpu)
183 fill_regs(struct thread *td, struct reg *regs)
185 struct trapframe *frame;
187 frame = td->td_frame;
188 regs->sepc = frame->tf_sepc;
189 regs->sstatus = frame->tf_sstatus;
190 regs->ra = frame->tf_ra;
191 regs->sp = frame->tf_sp;
192 regs->gp = frame->tf_gp;
193 regs->tp = frame->tf_tp;
195 memcpy(regs->t, frame->tf_t, sizeof(regs->t));
196 memcpy(regs->s, frame->tf_s, sizeof(regs->s));
197 memcpy(regs->a, frame->tf_a, sizeof(regs->a));
203 set_regs(struct thread *td, struct reg *regs)
205 struct trapframe *frame;
207 frame = td->td_frame;
208 frame->tf_sepc = regs->sepc;
209 frame->tf_ra = regs->ra;
210 frame->tf_sp = regs->sp;
211 frame->tf_gp = regs->gp;
212 frame->tf_tp = regs->tp;
214 memcpy(frame->tf_t, regs->t, sizeof(frame->tf_t));
215 memcpy(frame->tf_s, regs->s, sizeof(frame->tf_s));
216 memcpy(frame->tf_a, regs->a, sizeof(frame->tf_a));
222 fill_fpregs(struct thread *td, struct fpreg *regs)
229 if ((pcb->pcb_fpflags & PCB_FP_STARTED) != 0) {
231 * If we have just been running FPE instructions we will
232 * need to save the state to memcpy it below.
237 memcpy(regs->fp_x, pcb->pcb_x, sizeof(regs->fp_x));
238 regs->fp_fcsr = pcb->pcb_fcsr;
241 memset(regs, 0, sizeof(*regs));
247 set_fpregs(struct thread *td, struct fpreg *regs)
250 struct trapframe *frame;
253 frame = td->td_frame;
256 memcpy(pcb->pcb_x, regs->fp_x, sizeof(regs->fp_x));
257 pcb->pcb_fcsr = regs->fp_fcsr;
258 pcb->pcb_fpflags |= PCB_FP_STARTED;
259 frame->tf_sstatus &= ~SSTATUS_FS_MASK;
260 frame->tf_sstatus |= SSTATUS_FS_CLEAN;
267 fill_dbregs(struct thread *td, struct dbreg *regs)
270 panic("fill_dbregs");
274 set_dbregs(struct thread *td, struct dbreg *regs)
281 ptrace_set_pc(struct thread *td, u_long addr)
284 td->td_frame->tf_sepc = addr;
289 ptrace_single_step(struct thread *td)
297 ptrace_clear_single_step(struct thread *td)
305 exec_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack)
307 struct trapframe *tf;
313 memset(tf, 0, sizeof(struct trapframe));
316 tf->tf_sp = STACKALIGN(stack);
317 tf->tf_ra = imgp->entry_addr;
318 tf->tf_sepc = imgp->entry_addr;
320 pcb->pcb_fpflags &= ~PCB_FP_STARTED;
323 /* Sanity check these are the same size, they will be memcpy'd to and fro */
324 CTASSERT(sizeof(((struct trapframe *)0)->tf_a) ==
325 sizeof((struct gpregs *)0)->gp_a);
326 CTASSERT(sizeof(((struct trapframe *)0)->tf_s) ==
327 sizeof((struct gpregs *)0)->gp_s);
328 CTASSERT(sizeof(((struct trapframe *)0)->tf_t) ==
329 sizeof((struct gpregs *)0)->gp_t);
330 CTASSERT(sizeof(((struct trapframe *)0)->tf_a) ==
331 sizeof((struct reg *)0)->a);
332 CTASSERT(sizeof(((struct trapframe *)0)->tf_s) ==
333 sizeof((struct reg *)0)->s);
334 CTASSERT(sizeof(((struct trapframe *)0)->tf_t) ==
335 sizeof((struct reg *)0)->t);
337 /* Support for FDT configurations only. */
341 get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
343 struct trapframe *tf = td->td_frame;
345 memcpy(mcp->mc_gpregs.gp_t, tf->tf_t, sizeof(mcp->mc_gpregs.gp_t));
346 memcpy(mcp->mc_gpregs.gp_s, tf->tf_s, sizeof(mcp->mc_gpregs.gp_s));
347 memcpy(mcp->mc_gpregs.gp_a, tf->tf_a, sizeof(mcp->mc_gpregs.gp_a));
349 if (clear_ret & GET_MC_CLEAR_RET) {
350 mcp->mc_gpregs.gp_a[0] = 0;
351 mcp->mc_gpregs.gp_t[0] = 0; /* clear syscall error */
354 mcp->mc_gpregs.gp_ra = tf->tf_ra;
355 mcp->mc_gpregs.gp_sp = tf->tf_sp;
356 mcp->mc_gpregs.gp_gp = tf->tf_gp;
357 mcp->mc_gpregs.gp_tp = tf->tf_tp;
358 mcp->mc_gpregs.gp_sepc = tf->tf_sepc;
359 mcp->mc_gpregs.gp_sstatus = tf->tf_sstatus;
360 get_fpcontext(td, mcp);
366 set_mcontext(struct thread *td, mcontext_t *mcp)
368 struct trapframe *tf;
373 * Permit changes to the USTATUS bits of SSTATUS.
375 * Ignore writes to read-only bits (SD, XS).
377 * Ignore writes to the FS field as set_fpcontext() will set
380 if (((mcp->mc_gpregs.gp_sstatus ^ tf->tf_sstatus) &
381 ~(SSTATUS_SD | SSTATUS_XS_MASK | SSTATUS_FS_MASK | SSTATUS_UPIE |
385 memcpy(tf->tf_t, mcp->mc_gpregs.gp_t, sizeof(tf->tf_t));
386 memcpy(tf->tf_s, mcp->mc_gpregs.gp_s, sizeof(tf->tf_s));
387 memcpy(tf->tf_a, mcp->mc_gpregs.gp_a, sizeof(tf->tf_a));
389 tf->tf_ra = mcp->mc_gpregs.gp_ra;
390 tf->tf_sp = mcp->mc_gpregs.gp_sp;
391 tf->tf_gp = mcp->mc_gpregs.gp_gp;
392 tf->tf_sepc = mcp->mc_gpregs.gp_sepc;
393 tf->tf_sstatus = mcp->mc_gpregs.gp_sstatus;
394 set_fpcontext(td, mcp);
400 get_fpcontext(struct thread *td, mcontext_t *mcp)
407 curpcb = curthread->td_pcb;
409 KASSERT(td->td_pcb == curpcb, ("Invalid fpe pcb"));
411 if ((curpcb->pcb_fpflags & PCB_FP_STARTED) != 0) {
413 * If we have just been running FPE instructions we will
414 * need to save the state to memcpy it below.
418 KASSERT((curpcb->pcb_fpflags & ~PCB_FP_USERMASK) == 0,
419 ("Non-userspace FPE flags set in get_fpcontext"));
420 memcpy(mcp->mc_fpregs.fp_x, curpcb->pcb_x,
421 sizeof(mcp->mc_fpregs));
422 mcp->mc_fpregs.fp_fcsr = curpcb->pcb_fcsr;
423 mcp->mc_fpregs.fp_flags = curpcb->pcb_fpflags;
424 mcp->mc_flags |= _MC_FP_VALID;
432 set_fpcontext(struct thread *td, mcontext_t *mcp)
438 td->td_frame->tf_sstatus &= ~SSTATUS_FS_MASK;
439 td->td_frame->tf_sstatus |= SSTATUS_FS_OFF;
444 if ((mcp->mc_flags & _MC_FP_VALID) != 0) {
445 curpcb = curthread->td_pcb;
446 /* FPE usage is enabled, override registers. */
447 memcpy(curpcb->pcb_x, mcp->mc_fpregs.fp_x,
448 sizeof(mcp->mc_fpregs));
449 curpcb->pcb_fcsr = mcp->mc_fpregs.fp_fcsr;
450 curpcb->pcb_fpflags = mcp->mc_fpregs.fp_flags & PCB_FP_USERMASK;
451 td->td_frame->tf_sstatus |= SSTATUS_FS_CLEAN;
465 if (!sched_runnable())
479 * Try to power down using the HSM SBI extension and fall back to a
483 if (sbi_probe_extension(SBI_EXT_ID_HSM) != 0)
486 __asm __volatile("wfi");
491 * Flush the D-cache for non-DMA I/O so that the I-cache can
492 * be made coherent later.
495 cpu_flush_dcache(void *ptr, size_t len)
501 /* Get current clock frequency for the given CPU ID. */
503 cpu_est_clockrate(int cpu_id, uint64_t *rate)
506 panic("cpu_est_clockrate");
510 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
521 if (td->td_md.md_spinlock_count == 0) {
522 reg = intr_disable();
523 td->td_md.md_spinlock_count = 1;
524 td->td_md.md_saved_sstatus_ie = reg;
527 td->td_md.md_spinlock_count++;
534 register_t sstatus_ie;
537 sstatus_ie = td->td_md.md_saved_sstatus_ie;
538 td->td_md.md_spinlock_count--;
539 if (td->td_md.md_spinlock_count == 0) {
541 intr_restore(sstatus_ie);
545 #ifndef _SYS_SYSPROTO_H_
546 struct sigreturn_args {
552 sys_sigreturn(struct thread *td, struct sigreturn_args *uap)
557 if (copyin(uap->sigcntxp, &uc, sizeof(uc)))
560 error = set_mcontext(td, &uc.uc_mcontext);
564 /* Restore signal mask. */
565 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
567 return (EJUSTRETURN);
571 * Construct a PCB from a trapframe. This is called from kdb_trap() where
572 * we want to start a backtrace from the function that caused us to enter
573 * the debugger. We have the context in the trapframe, but base the trace
574 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
575 * enough for a backtrace.
578 makectx(struct trapframe *tf, struct pcb *pcb)
581 memcpy(pcb->pcb_s, tf->tf_s, sizeof(tf->tf_s));
583 pcb->pcb_ra = tf->tf_sepc;
584 pcb->pcb_sp = tf->tf_sp;
585 pcb->pcb_gp = tf->tf_gp;
586 pcb->pcb_tp = tf->tf_tp;
590 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
592 struct sigframe *fp, frame;
593 struct sysentvec *sysent;
594 struct trapframe *tf;
603 PROC_LOCK_ASSERT(p, MA_OWNED);
605 sig = ksi->ksi_signo;
607 mtx_assert(&psp->ps_mtx, MA_OWNED);
610 onstack = sigonstack(tf->tf_sp);
612 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
615 /* Allocate and validate space for the signal handler context. */
616 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !onstack &&
617 SIGISMEMBER(psp->ps_sigonstack, sig)) {
618 fp = (struct sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
619 td->td_sigstk.ss_size);
621 fp = (struct sigframe *)td->td_frame->tf_sp;
624 /* Make room, keeping the stack aligned */
626 fp = (struct sigframe *)STACKALIGN(fp);
628 /* Fill in the frame to copy out */
629 bzero(&frame, sizeof(frame));
630 get_mcontext(td, &frame.sf_uc.uc_mcontext, 0);
631 frame.sf_si = ksi->ksi_info;
632 frame.sf_uc.uc_sigmask = *mask;
633 frame.sf_uc.uc_stack = td->td_sigstk;
634 frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) != 0 ?
635 (onstack ? SS_ONSTACK : 0) : SS_DISABLE;
636 mtx_unlock(&psp->ps_mtx);
637 PROC_UNLOCK(td->td_proc);
639 /* Copy the sigframe out to the user's stack. */
640 if (copyout(&frame, fp, sizeof(*fp)) != 0) {
641 /* Process has trashed its stack. Kill it. */
642 CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp);
648 tf->tf_a[1] = (register_t)&fp->sf_si;
649 tf->tf_a[2] = (register_t)&fp->sf_uc;
651 tf->tf_sepc = (register_t)catcher;
652 tf->tf_sp = (register_t)fp;
654 sysent = p->p_sysent;
655 if (sysent->sv_sigcode_base != 0)
656 tf->tf_ra = (register_t)sysent->sv_sigcode_base;
658 tf->tf_ra = (register_t)(sysent->sv_psstrings -
659 *(sysent->sv_szsigcode));
661 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_sepc,
665 mtx_lock(&psp->ps_mtx);
669 init_proc0(vm_offset_t kstack)
675 proc_linkup0(&proc0, &thread0);
676 thread0.td_kstack = kstack;
677 thread0.td_kstack_pages = KSTACK_PAGES;
678 thread0.td_pcb = (struct pcb *)(thread0.td_kstack +
679 thread0.td_kstack_pages * PAGE_SIZE) - 1;
680 thread0.td_pcb->pcb_fpflags = 0;
681 thread0.td_frame = &proc0_tf;
682 pcpup->pc_curpcb = thread0.td_pcb;
687 try_load_dtb(caddr_t kmdp)
691 dtbp = MD_FETCH(kmdp, MODINFOMD_DTBP, vm_offset_t);
693 #if defined(FDT_DTB_STATIC)
695 * In case the device tree blob was not retrieved (from metadata) try
696 * to use the statically embedded one.
698 if (dtbp == (vm_offset_t)NULL)
699 dtbp = (vm_offset_t)&fdt_static_dtb;
702 if (dtbp == (vm_offset_t)NULL) {
703 printf("ERROR loading DTB\n");
707 if (OF_install(OFW_FDT, 0) == FALSE)
708 panic("Cannot install FDT");
710 if (OF_init((void *)dtbp) != 0)
711 panic("OF_init failed with the found device tree");
721 dcache_line_size = 0;
722 icache_line_size = 0;
723 idcache_line_size = 0;
727 * Fake up a boot descriptor table.
730 fake_preload_metadata(struct riscv_bootparams *rvbp)
732 static uint32_t fake_preload[48];
733 vm_offset_t lastaddr;
734 size_t fake_size, dtb_size;
736 #define PRELOAD_PUSH_VALUE(type, value) do { \
737 *(type *)((char *)fake_preload + fake_size) = (value); \
738 fake_size += sizeof(type); \
741 #define PRELOAD_PUSH_STRING(str) do { \
743 ssize = strlen(str) + 1; \
744 PRELOAD_PUSH_VALUE(uint32_t, ssize); \
745 strcpy(((char *)fake_preload + fake_size), str); \
746 fake_size += ssize; \
747 fake_size = roundup(fake_size, sizeof(u_long)); \
751 lastaddr = (vm_offset_t)&end;
753 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_NAME);
754 PRELOAD_PUSH_STRING("kernel");
755 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_TYPE);
756 PRELOAD_PUSH_STRING("elf kernel");
758 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_ADDR);
759 PRELOAD_PUSH_VALUE(uint32_t, sizeof(vm_offset_t));
760 PRELOAD_PUSH_VALUE(uint64_t, KERNBASE);
762 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_SIZE);
763 PRELOAD_PUSH_VALUE(uint32_t, sizeof(size_t));
764 PRELOAD_PUSH_VALUE(uint64_t, (size_t)((vm_offset_t)&end - KERNBASE));
766 /* Copy the DTB to KVA space. */
767 lastaddr = roundup(lastaddr, sizeof(int));
768 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_METADATA | MODINFOMD_DTBP);
769 PRELOAD_PUSH_VALUE(uint32_t, sizeof(vm_offset_t));
770 PRELOAD_PUSH_VALUE(vm_offset_t, lastaddr);
771 dtb_size = fdt_totalsize(rvbp->dtbp_virt);
772 memmove((void *)lastaddr, (const void *)rvbp->dtbp_virt, dtb_size);
773 lastaddr = roundup(lastaddr + dtb_size, sizeof(int));
775 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_METADATA | MODINFOMD_KERNEND);
776 PRELOAD_PUSH_VALUE(uint32_t, sizeof(vm_offset_t));
777 PRELOAD_PUSH_VALUE(vm_offset_t, lastaddr);
779 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_METADATA | MODINFOMD_HOWTO);
780 PRELOAD_PUSH_VALUE(uint32_t, sizeof(int));
781 PRELOAD_PUSH_VALUE(int, RB_VERBOSE);
784 PRELOAD_PUSH_VALUE(uint32_t, 0);
785 PRELOAD_PUSH_VALUE(uint32_t, 0);
786 preload_metadata = (caddr_t)fake_preload;
788 /* Check if bootloader clobbered part of the kernel with the DTB. */
789 KASSERT(rvbp->dtbp_phys + dtb_size <= rvbp->kern_phys ||
790 rvbp->dtbp_phys >= rvbp->kern_phys + (lastaddr - KERNBASE),
791 ("FDT (%lx-%lx) and kernel (%lx-%lx) overlap", rvbp->dtbp_phys,
792 rvbp->dtbp_phys + dtb_size, rvbp->kern_phys,
793 rvbp->kern_phys + (lastaddr - KERNBASE)));
794 KASSERT(fake_size < sizeof(fake_preload),
795 ("Too many fake_preload items"));
797 if (boothowto & RB_VERBOSE)
798 printf("FDT phys (%lx-%lx), kernel phys (%lx-%lx)\n",
799 rvbp->dtbp_phys, rvbp->dtbp_phys + dtb_size,
800 rvbp->kern_phys, rvbp->kern_phys + (lastaddr - KERNBASE));
807 vm_offset_t lastaddr;
809 vm_offset_t ksym_start, ksym_end;
813 /* Find the kernel address */
814 kmdp = preload_search_by_type("elf kernel");
816 kmdp = preload_search_by_type("elf64 kernel");
817 KASSERT(kmdp != NULL, ("No preload metadata found!"));
819 /* Read the boot metadata */
820 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
821 lastaddr = MD_FETCH(kmdp, MODINFOMD_KERNEND, vm_offset_t);
822 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *);
823 if (kern_envp != NULL)
824 init_static_kenv(kern_envp, 0);
826 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
827 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
828 db_fetch_ksymtab(ksym_start, ksym_end);
837 initriscv(struct riscv_bootparams *rvbp)
839 struct mem_region mem_regions[FDT_MEM_REGIONS];
842 vm_offset_t lastaddr;
849 TSRAW(&thread0, TS_ENTER, __func__, NULL);
851 /* Set the pcpu data, this is needed by pmap_bootstrap */
853 pcpu_init(pcpup, 0, sizeof(struct pcpu));
855 /* Set the pcpu pointer */
856 __asm __volatile("mv tp, %0" :: "r"(pcpup));
858 PCPU_SET(curthread, &thread0);
860 /* Initialize SBI interface. */
863 /* Parse the boot metadata. */
864 if (rvbp->modulep != 0) {
865 preload_metadata = (caddr_t)rvbp->modulep;
867 fake_preload_metadata(rvbp);
869 lastaddr = parse_metadata();
873 * Look for the boot hart ID. This was either passed in directly from
874 * the SBI firmware and handled by locore, or was stored in the device
875 * tree by an earlier boot stage.
877 chosen = OF_finddevice("/chosen");
878 if (OF_getencprop(chosen, "boot-hartid", &hart, sizeof(hart)) != -1) {
882 if (boot_hart == BOOT_HART_INVALID) {
883 panic("Boot hart ID was not properly set");
885 pcpup->pc_hart = boot_hart;
889 * Exclude reserved memory specified by the device tree. Typically,
890 * this contains an entry for memory used by the runtime SBI firmware.
892 if (fdt_get_reserved_mem(mem_regions, &mem_regions_sz) == 0) {
893 physmem_exclude_regions(mem_regions, mem_regions_sz,
894 EXFLAG_NODUMP | EXFLAG_NOALLOC);
897 /* Grab physical memory regions information from device tree. */
898 if (fdt_get_mem_regions(mem_regions, &mem_regions_sz, NULL) != 0) {
899 panic("Cannot get physical memory regions");
901 physmem_hardware_regions(mem_regions, mem_regions_sz);
904 /* Do basic tuning, hz etc */
909 /* Bootstrap enough of pmap to enter the kernel proper */
910 kernlen = (lastaddr - KERNBASE);
911 pmap_bootstrap(rvbp->kern_l1pt, rvbp->kern_phys, kernlen);
915 * XXX: Exclude the lowest 2MB of physical memory, if it hasn't been
916 * already, as this area is assumed to contain the SBI firmware. This
917 * is a little fragile, but it is consistent with the platforms we
920 * TODO: remove this when the all regular booting methods properly
921 * report their reserved memory in the device tree.
923 if (mem_regions[0].mr_start == physmap[0]) {
924 physmem_exclude_region(mem_regions[0].mr_start, L2_SIZE,
925 EXFLAG_NODUMP | EXFLAG_NOALLOC);
928 physmem_init_kernel_globals();
930 /* Establish static device mappings */
931 devmap_bootstrap(0, NULL);
935 init_proc0(rvbp->kern_stack);
937 msgbufinit(msgbufp, msgbufsize);
939 init_param2(physmem);
942 if (boothowto & RB_VERBOSE)
943 physmem_print_tables();
952 bzero(void *buf, size_t len)