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>
48 #include <sys/devmap.h>
50 #include <sys/imgact.h>
52 #include <sys/kernel.h>
54 #include <sys/limits.h>
55 #include <sys/linker.h>
56 #include <sys/msgbuf.h>
58 #include <sys/physmem.h>
60 #include <sys/ptrace.h>
61 #include <sys/reboot.h>
62 #include <sys/rwlock.h>
63 #include <sys/sched.h>
64 #include <sys/signalvar.h>
65 #include <sys/syscallsubr.h>
66 #include <sys/sysent.h>
67 #include <sys/sysproto.h>
68 #include <sys/tslog.h>
69 #include <sys/ucontext.h>
70 #include <sys/vmmeter.h>
73 #include <vm/vm_param.h>
74 #include <vm/vm_kern.h>
75 #include <vm/vm_object.h>
76 #include <vm/vm_page.h>
77 #include <vm/vm_phys.h>
79 #include <vm/vm_map.h>
80 #include <vm/vm_pager.h>
82 #include <machine/cpu.h>
83 #include <machine/intr.h>
84 #include <machine/kdb.h>
85 #include <machine/machdep.h>
86 #include <machine/metadata.h>
87 #include <machine/pcb.h>
88 #include <machine/pte.h>
89 #include <machine/reg.h>
90 #include <machine/riscvreg.h>
91 #include <machine/sbi.h>
92 #include <machine/trap.h>
93 #include <machine/vmparam.h>
96 #include <machine/fpe.h>
100 #include <contrib/libfdt/libfdt.h>
101 #include <dev/fdt/fdt_common.h>
102 #include <dev/ofw/openfirm.h>
105 static void get_fpcontext(struct thread *td, mcontext_t *mcp);
106 static void set_fpcontext(struct thread *td, mcontext_t *mcp);
108 struct pcpu __pcpu[MAXCPU];
110 static struct trapframe proc0_tf;
115 #define DTB_SIZE_MAX (1024 * 1024)
117 vm_paddr_t physmap[PHYS_AVAIL_ENTRIES];
120 struct kva_md_info kmi;
122 int64_t dcache_line_size; /* The minimum D cache line size */
123 int64_t icache_line_size; /* The minimum I cache line size */
124 int64_t idcache_line_size; /* The minimum cache line size */
126 #define BOOT_HART_INVALID 0xffffffff
127 uint32_t boot_hart = BOOT_HART_INVALID; /* The hart we booted on. */
133 static char static_kenv[PAGE_SIZE];
136 cpu_startup(void *dummy)
142 printf("real memory = %ju (%ju MB)\n", ptoa((uintmax_t)realmem),
143 ptoa((uintmax_t)realmem) / (1024 * 1024));
146 * Display any holes after the first chunk of extended memory.
151 printf("Physical memory chunk(s):\n");
152 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
155 size = phys_avail[indx + 1] - phys_avail[indx];
157 "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n",
158 (uintmax_t)phys_avail[indx],
159 (uintmax_t)phys_avail[indx + 1] - 1,
160 (uintmax_t)size, (uintmax_t)size / PAGE_SIZE);
164 vm_ksubmap_init(&kmi);
166 printf("avail memory = %ju (%ju MB)\n",
167 ptoa((uintmax_t)vm_free_count()),
168 ptoa((uintmax_t)vm_free_count()) / (1024 * 1024));
170 devmap_print_table();
173 vm_pager_bufferinit();
176 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
179 cpu_idle_wakeup(int cpu)
186 fill_regs(struct thread *td, struct reg *regs)
188 struct trapframe *frame;
190 frame = td->td_frame;
191 regs->sepc = frame->tf_sepc;
192 regs->sstatus = frame->tf_sstatus;
193 regs->ra = frame->tf_ra;
194 regs->sp = frame->tf_sp;
195 regs->gp = frame->tf_gp;
196 regs->tp = frame->tf_tp;
198 memcpy(regs->t, frame->tf_t, sizeof(regs->t));
199 memcpy(regs->s, frame->tf_s, sizeof(regs->s));
200 memcpy(regs->a, frame->tf_a, sizeof(regs->a));
206 set_regs(struct thread *td, struct reg *regs)
208 struct trapframe *frame;
210 frame = td->td_frame;
211 frame->tf_sepc = regs->sepc;
212 frame->tf_ra = regs->ra;
213 frame->tf_sp = regs->sp;
214 frame->tf_gp = regs->gp;
215 frame->tf_tp = regs->tp;
217 memcpy(frame->tf_t, regs->t, sizeof(frame->tf_t));
218 memcpy(frame->tf_s, regs->s, sizeof(frame->tf_s));
219 memcpy(frame->tf_a, regs->a, sizeof(frame->tf_a));
225 fill_fpregs(struct thread *td, struct fpreg *regs)
232 if ((pcb->pcb_fpflags & PCB_FP_STARTED) != 0) {
234 * If we have just been running FPE instructions we will
235 * need to save the state to memcpy it below.
240 memcpy(regs->fp_x, pcb->pcb_x, sizeof(regs->fp_x));
241 regs->fp_fcsr = pcb->pcb_fcsr;
244 memset(regs, 0, sizeof(*regs));
250 set_fpregs(struct thread *td, struct fpreg *regs)
253 struct trapframe *frame;
256 frame = td->td_frame;
259 memcpy(pcb->pcb_x, regs->fp_x, sizeof(regs->fp_x));
260 pcb->pcb_fcsr = regs->fp_fcsr;
261 pcb->pcb_fpflags |= PCB_FP_STARTED;
262 frame->tf_sstatus &= ~SSTATUS_FS_MASK;
263 frame->tf_sstatus |= SSTATUS_FS_CLEAN;
270 fill_dbregs(struct thread *td, struct dbreg *regs)
273 panic("fill_dbregs");
277 set_dbregs(struct thread *td, struct dbreg *regs)
284 ptrace_set_pc(struct thread *td, u_long addr)
287 td->td_frame->tf_sepc = addr;
292 ptrace_single_step(struct thread *td)
300 ptrace_clear_single_step(struct thread *td)
308 exec_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack)
310 struct trapframe *tf;
316 memset(tf, 0, sizeof(struct trapframe));
319 tf->tf_sp = STACKALIGN(stack);
320 tf->tf_ra = imgp->entry_addr;
321 tf->tf_sepc = imgp->entry_addr;
323 pcb->pcb_fpflags &= ~PCB_FP_STARTED;
326 /* Sanity check these are the same size, they will be memcpy'd to and fro */
327 CTASSERT(sizeof(((struct trapframe *)0)->tf_a) ==
328 sizeof((struct gpregs *)0)->gp_a);
329 CTASSERT(sizeof(((struct trapframe *)0)->tf_s) ==
330 sizeof((struct gpregs *)0)->gp_s);
331 CTASSERT(sizeof(((struct trapframe *)0)->tf_t) ==
332 sizeof((struct gpregs *)0)->gp_t);
333 CTASSERT(sizeof(((struct trapframe *)0)->tf_a) ==
334 sizeof((struct reg *)0)->a);
335 CTASSERT(sizeof(((struct trapframe *)0)->tf_s) ==
336 sizeof((struct reg *)0)->s);
337 CTASSERT(sizeof(((struct trapframe *)0)->tf_t) ==
338 sizeof((struct reg *)0)->t);
340 /* Support for FDT configurations only. */
344 get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
346 struct trapframe *tf = td->td_frame;
348 memcpy(mcp->mc_gpregs.gp_t, tf->tf_t, sizeof(mcp->mc_gpregs.gp_t));
349 memcpy(mcp->mc_gpregs.gp_s, tf->tf_s, sizeof(mcp->mc_gpregs.gp_s));
350 memcpy(mcp->mc_gpregs.gp_a, tf->tf_a, sizeof(mcp->mc_gpregs.gp_a));
352 if (clear_ret & GET_MC_CLEAR_RET) {
353 mcp->mc_gpregs.gp_a[0] = 0;
354 mcp->mc_gpregs.gp_t[0] = 0; /* clear syscall error */
357 mcp->mc_gpregs.gp_ra = tf->tf_ra;
358 mcp->mc_gpregs.gp_sp = tf->tf_sp;
359 mcp->mc_gpregs.gp_gp = tf->tf_gp;
360 mcp->mc_gpregs.gp_tp = tf->tf_tp;
361 mcp->mc_gpregs.gp_sepc = tf->tf_sepc;
362 mcp->mc_gpregs.gp_sstatus = tf->tf_sstatus;
363 get_fpcontext(td, mcp);
369 set_mcontext(struct thread *td, mcontext_t *mcp)
371 struct trapframe *tf;
376 * Permit changes to the USTATUS bits of SSTATUS.
378 * Ignore writes to read-only bits (SD, XS).
380 * Ignore writes to the FS field as set_fpcontext() will set
383 if (((mcp->mc_gpregs.gp_sstatus ^ tf->tf_sstatus) &
384 ~(SSTATUS_SD | SSTATUS_XS_MASK | SSTATUS_FS_MASK | SSTATUS_UPIE |
388 memcpy(tf->tf_t, mcp->mc_gpregs.gp_t, sizeof(tf->tf_t));
389 memcpy(tf->tf_s, mcp->mc_gpregs.gp_s, sizeof(tf->tf_s));
390 memcpy(tf->tf_a, mcp->mc_gpregs.gp_a, sizeof(tf->tf_a));
392 tf->tf_ra = mcp->mc_gpregs.gp_ra;
393 tf->tf_sp = mcp->mc_gpregs.gp_sp;
394 tf->tf_gp = mcp->mc_gpregs.gp_gp;
395 tf->tf_sepc = mcp->mc_gpregs.gp_sepc;
396 tf->tf_sstatus = mcp->mc_gpregs.gp_sstatus;
397 set_fpcontext(td, mcp);
403 get_fpcontext(struct thread *td, mcontext_t *mcp)
410 curpcb = curthread->td_pcb;
412 KASSERT(td->td_pcb == curpcb, ("Invalid fpe pcb"));
414 if ((curpcb->pcb_fpflags & PCB_FP_STARTED) != 0) {
416 * If we have just been running FPE instructions we will
417 * need to save the state to memcpy it below.
421 KASSERT((curpcb->pcb_fpflags & ~PCB_FP_USERMASK) == 0,
422 ("Non-userspace FPE flags set in get_fpcontext"));
423 memcpy(mcp->mc_fpregs.fp_x, curpcb->pcb_x,
424 sizeof(mcp->mc_fpregs.fp_x));
425 mcp->mc_fpregs.fp_fcsr = curpcb->pcb_fcsr;
426 mcp->mc_fpregs.fp_flags = curpcb->pcb_fpflags;
427 mcp->mc_flags |= _MC_FP_VALID;
435 set_fpcontext(struct thread *td, mcontext_t *mcp)
441 td->td_frame->tf_sstatus &= ~SSTATUS_FS_MASK;
442 td->td_frame->tf_sstatus |= SSTATUS_FS_OFF;
447 if ((mcp->mc_flags & _MC_FP_VALID) != 0) {
448 curpcb = curthread->td_pcb;
449 /* FPE usage is enabled, override registers. */
450 memcpy(curpcb->pcb_x, mcp->mc_fpregs.fp_x,
451 sizeof(mcp->mc_fpregs.fp_x));
452 curpcb->pcb_fcsr = mcp->mc_fpregs.fp_fcsr;
453 curpcb->pcb_fpflags = mcp->mc_fpregs.fp_flags & PCB_FP_USERMASK;
454 td->td_frame->tf_sstatus |= SSTATUS_FS_CLEAN;
468 if (!sched_runnable())
482 * Try to power down using the HSM SBI extension and fall back to a
486 if (sbi_probe_extension(SBI_EXT_ID_HSM) != 0)
489 __asm __volatile("wfi");
494 * Flush the D-cache for non-DMA I/O so that the I-cache can
495 * be made coherent later.
498 cpu_flush_dcache(void *ptr, size_t len)
504 /* Get current clock frequency for the given CPU ID. */
506 cpu_est_clockrate(int cpu_id, uint64_t *rate)
509 panic("cpu_est_clockrate");
513 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
524 if (td->td_md.md_spinlock_count == 0) {
525 reg = intr_disable();
526 td->td_md.md_spinlock_count = 1;
527 td->td_md.md_saved_sstatus_ie = reg;
530 td->td_md.md_spinlock_count++;
537 register_t sstatus_ie;
540 sstatus_ie = td->td_md.md_saved_sstatus_ie;
541 td->td_md.md_spinlock_count--;
542 if (td->td_md.md_spinlock_count == 0) {
544 intr_restore(sstatus_ie);
548 #ifndef _SYS_SYSPROTO_H_
549 struct sigreturn_args {
555 sys_sigreturn(struct thread *td, struct sigreturn_args *uap)
560 if (copyin(uap->sigcntxp, &uc, sizeof(uc)))
563 error = set_mcontext(td, &uc.uc_mcontext);
567 /* Restore signal mask. */
568 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
570 return (EJUSTRETURN);
574 * Construct a PCB from a trapframe. This is called from kdb_trap() where
575 * we want to start a backtrace from the function that caused us to enter
576 * the debugger. We have the context in the trapframe, but base the trace
577 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
578 * enough for a backtrace.
581 makectx(struct trapframe *tf, struct pcb *pcb)
584 memcpy(pcb->pcb_s, tf->tf_s, sizeof(tf->tf_s));
586 pcb->pcb_ra = tf->tf_sepc;
587 pcb->pcb_sp = tf->tf_sp;
588 pcb->pcb_gp = tf->tf_gp;
589 pcb->pcb_tp = tf->tf_tp;
593 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
595 struct sigframe *fp, frame;
596 struct sysentvec *sysent;
597 struct trapframe *tf;
606 PROC_LOCK_ASSERT(p, MA_OWNED);
608 sig = ksi->ksi_signo;
610 mtx_assert(&psp->ps_mtx, MA_OWNED);
613 onstack = sigonstack(tf->tf_sp);
615 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
618 /* Allocate and validate space for the signal handler context. */
619 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !onstack &&
620 SIGISMEMBER(psp->ps_sigonstack, sig)) {
621 fp = (struct sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
622 td->td_sigstk.ss_size);
624 fp = (struct sigframe *)td->td_frame->tf_sp;
627 /* Make room, keeping the stack aligned */
629 fp = (struct sigframe *)STACKALIGN(fp);
631 /* Fill in the frame to copy out */
632 bzero(&frame, sizeof(frame));
633 get_mcontext(td, &frame.sf_uc.uc_mcontext, 0);
634 frame.sf_si = ksi->ksi_info;
635 frame.sf_uc.uc_sigmask = *mask;
636 frame.sf_uc.uc_stack = td->td_sigstk;
637 frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) != 0 ?
638 (onstack ? SS_ONSTACK : 0) : SS_DISABLE;
639 mtx_unlock(&psp->ps_mtx);
640 PROC_UNLOCK(td->td_proc);
642 /* Copy the sigframe out to the user's stack. */
643 if (copyout(&frame, fp, sizeof(*fp)) != 0) {
644 /* Process has trashed its stack. Kill it. */
645 CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp);
651 tf->tf_a[1] = (register_t)&fp->sf_si;
652 tf->tf_a[2] = (register_t)&fp->sf_uc;
654 tf->tf_sepc = (register_t)catcher;
655 tf->tf_sp = (register_t)fp;
657 sysent = p->p_sysent;
658 if (sysent->sv_sigcode_base != 0)
659 tf->tf_ra = (register_t)sysent->sv_sigcode_base;
661 tf->tf_ra = (register_t)(sysent->sv_psstrings -
662 *(sysent->sv_szsigcode));
664 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_sepc,
668 mtx_lock(&psp->ps_mtx);
672 init_proc0(vm_offset_t kstack)
678 proc_linkup0(&proc0, &thread0);
679 thread0.td_kstack = kstack;
680 thread0.td_kstack_pages = KSTACK_PAGES;
681 thread0.td_pcb = (struct pcb *)(thread0.td_kstack +
682 thread0.td_kstack_pages * PAGE_SIZE) - 1;
683 thread0.td_pcb->pcb_fpflags = 0;
684 thread0.td_frame = &proc0_tf;
685 pcpup->pc_curpcb = thread0.td_pcb;
690 try_load_dtb(caddr_t kmdp)
694 dtbp = MD_FETCH(kmdp, MODINFOMD_DTBP, vm_offset_t);
696 #if defined(FDT_DTB_STATIC)
698 * In case the device tree blob was not retrieved (from metadata) try
699 * to use the statically embedded one.
701 if (dtbp == (vm_offset_t)NULL)
702 dtbp = (vm_offset_t)&fdt_static_dtb;
705 if (dtbp == (vm_offset_t)NULL) {
706 printf("ERROR loading DTB\n");
710 if (OF_install(OFW_FDT, 0) == FALSE)
711 panic("Cannot install FDT");
713 if (OF_init((void *)dtbp) != 0)
714 panic("OF_init failed with the found device tree");
724 dcache_line_size = 0;
725 icache_line_size = 0;
726 idcache_line_size = 0;
730 * Fake up a boot descriptor table.
733 fake_preload_metadata(struct riscv_bootparams *rvbp)
735 static uint32_t fake_preload[48];
736 vm_offset_t lastaddr;
737 size_t fake_size, dtb_size;
739 #define PRELOAD_PUSH_VALUE(type, value) do { \
740 *(type *)((char *)fake_preload + fake_size) = (value); \
741 fake_size += sizeof(type); \
744 #define PRELOAD_PUSH_STRING(str) do { \
746 ssize = strlen(str) + 1; \
747 PRELOAD_PUSH_VALUE(uint32_t, ssize); \
748 strcpy(((char *)fake_preload + fake_size), str); \
749 fake_size += ssize; \
750 fake_size = roundup(fake_size, sizeof(u_long)); \
754 lastaddr = (vm_offset_t)&end;
756 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_NAME);
757 PRELOAD_PUSH_STRING("kernel");
758 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_TYPE);
759 PRELOAD_PUSH_STRING("elf kernel");
761 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_ADDR);
762 PRELOAD_PUSH_VALUE(uint32_t, sizeof(vm_offset_t));
763 PRELOAD_PUSH_VALUE(uint64_t, KERNBASE);
765 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_SIZE);
766 PRELOAD_PUSH_VALUE(uint32_t, sizeof(size_t));
767 PRELOAD_PUSH_VALUE(uint64_t, (size_t)((vm_offset_t)&end - KERNBASE));
769 /* Copy the DTB to KVA space. */
770 lastaddr = roundup(lastaddr, sizeof(int));
771 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_METADATA | MODINFOMD_DTBP);
772 PRELOAD_PUSH_VALUE(uint32_t, sizeof(vm_offset_t));
773 PRELOAD_PUSH_VALUE(vm_offset_t, lastaddr);
774 dtb_size = fdt_totalsize(rvbp->dtbp_virt);
775 memmove((void *)lastaddr, (const void *)rvbp->dtbp_virt, dtb_size);
776 lastaddr = roundup(lastaddr + dtb_size, sizeof(int));
778 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_METADATA | MODINFOMD_KERNEND);
779 PRELOAD_PUSH_VALUE(uint32_t, sizeof(vm_offset_t));
780 PRELOAD_PUSH_VALUE(vm_offset_t, lastaddr);
782 PRELOAD_PUSH_VALUE(uint32_t, MODINFO_METADATA | MODINFOMD_HOWTO);
783 PRELOAD_PUSH_VALUE(uint32_t, sizeof(int));
784 PRELOAD_PUSH_VALUE(int, RB_VERBOSE);
787 PRELOAD_PUSH_VALUE(uint32_t, 0);
788 PRELOAD_PUSH_VALUE(uint32_t, 0);
789 preload_metadata = (caddr_t)fake_preload;
791 /* Check if bootloader clobbered part of the kernel with the DTB. */
792 KASSERT(rvbp->dtbp_phys + dtb_size <= rvbp->kern_phys ||
793 rvbp->dtbp_phys >= rvbp->kern_phys + (lastaddr - KERNBASE),
794 ("FDT (%lx-%lx) and kernel (%lx-%lx) overlap", rvbp->dtbp_phys,
795 rvbp->dtbp_phys + dtb_size, rvbp->kern_phys,
796 rvbp->kern_phys + (lastaddr - KERNBASE)));
797 KASSERT(fake_size < sizeof(fake_preload),
798 ("Too many fake_preload items"));
800 if (boothowto & RB_VERBOSE)
801 printf("FDT phys (%lx-%lx), kernel phys (%lx-%lx)\n",
802 rvbp->dtbp_phys, rvbp->dtbp_phys + dtb_size,
803 rvbp->kern_phys, rvbp->kern_phys + (lastaddr - KERNBASE));
808 parse_fdt_bootargs(void)
812 bootargs[sizeof(bootargs) - 1] = '\0';
813 if (fdt_get_chosen_bootargs(bootargs, sizeof(bootargs) - 1) == 0) {
814 boothowto |= boot_parse_cmdline(bootargs);
823 vm_offset_t lastaddr;
825 vm_offset_t ksym_start, ksym_end;
829 /* Find the kernel address */
830 kmdp = preload_search_by_type("elf kernel");
832 kmdp = preload_search_by_type("elf64 kernel");
833 KASSERT(kmdp != NULL, ("No preload metadata found!"));
835 /* Read the boot metadata */
836 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
837 lastaddr = MD_FETCH(kmdp, MODINFOMD_KERNEND, vm_offset_t);
838 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *);
839 if (kern_envp != NULL)
840 init_static_kenv(kern_envp, 0);
842 init_static_kenv(static_kenv, sizeof(static_kenv));
844 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
845 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
846 db_fetch_ksymtab(ksym_start, ksym_end);
850 if (kern_envp == NULL)
851 parse_fdt_bootargs();
857 initriscv(struct riscv_bootparams *rvbp)
859 struct mem_region mem_regions[FDT_MEM_REGIONS];
862 vm_offset_t lastaddr;
870 TSRAW(&thread0, TS_ENTER, __func__, NULL);
872 /* Set the pcpu data, this is needed by pmap_bootstrap */
874 pcpu_init(pcpup, 0, sizeof(struct pcpu));
876 /* Set the pcpu pointer */
877 __asm __volatile("mv tp, %0" :: "r"(pcpup));
879 PCPU_SET(curthread, &thread0);
881 /* Initialize SBI interface. */
884 /* Parse the boot metadata. */
885 if (rvbp->modulep != 0) {
886 preload_metadata = (caddr_t)rvbp->modulep;
888 fake_preload_metadata(rvbp);
890 lastaddr = parse_metadata();
894 * Look for the boot hart ID. This was either passed in directly from
895 * the SBI firmware and handled by locore, or was stored in the device
896 * tree by an earlier boot stage.
898 chosen = OF_finddevice("/chosen");
899 if (OF_getencprop(chosen, "boot-hartid", &hart, sizeof(hart)) != -1) {
903 if (boot_hart == BOOT_HART_INVALID) {
904 panic("Boot hart ID was not properly set");
906 pcpup->pc_hart = boot_hart;
910 * Exclude reserved memory specified by the device tree. Typically,
911 * this contains an entry for memory used by the runtime SBI firmware.
913 if (fdt_get_reserved_mem(mem_regions, &mem_regions_sz) == 0) {
914 physmem_exclude_regions(mem_regions, mem_regions_sz,
915 EXFLAG_NODUMP | EXFLAG_NOALLOC);
918 /* Grab physical memory regions information from device tree. */
919 if (fdt_get_mem_regions(mem_regions, &mem_regions_sz, NULL) != 0) {
920 panic("Cannot get physical memory regions");
922 physmem_hardware_regions(mem_regions, mem_regions_sz);
925 /* Do basic tuning, hz etc */
930 /* Bootstrap enough of pmap to enter the kernel proper */
931 kernlen = (lastaddr - KERNBASE);
932 pmap_bootstrap(rvbp->kern_l1pt, rvbp->kern_phys, kernlen);
936 * XXX: Exclude the lowest 2MB of physical memory, if it hasn't been
937 * already, as this area is assumed to contain the SBI firmware. This
938 * is a little fragile, but it is consistent with the platforms we
941 * TODO: remove this when the all regular booting methods properly
942 * report their reserved memory in the device tree.
944 if (mem_regions[0].mr_start == physmap[0]) {
945 physmem_exclude_region(mem_regions[0].mr_start, L2_SIZE,
946 EXFLAG_NODUMP | EXFLAG_NOALLOC);
949 physmem_init_kernel_globals();
951 /* Establish static device mappings */
952 devmap_bootstrap(0, NULL);
957 * Dump the boot metadata. We have to wait for cninit() since console
958 * output is required. If it's grossly incorrect the kernel will never
961 if (getenv_is_true("debug.dump_modinfo_at_boot"))
964 init_proc0(rvbp->kern_stack);
966 msgbufinit(msgbufp, msgbufsize);
968 init_param2(physmem);
971 env = kern_getenv("kernelname");
973 strlcpy(kernelname, env, sizeof(kernelname));
975 if (boothowto & RB_VERBOSE)
976 physmem_print_tables();
985 bzero(void *buf, size_t len)