1 /* $NetBSD: arm32_machdep.c,v 1.44 2004/03/24 15:34:47 atatat Exp $ */
4 * Copyright (c) 2004 Olivier Houchard
5 * Copyright (c) 1994-1998 Mark Brinicombe.
6 * Copyright (c) 1994 Brini.
9 * This code is derived from software written for Brini by Mark Brinicombe
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by Mark Brinicombe
22 * for the NetBSD Project.
23 * 4. The name of the company nor the name of the author may be used to
24 * endorse or promote products derived from this software without specific
25 * prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
28 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
29 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
30 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
31 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
32 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
33 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * Machine dependant functions for kernel setup
42 * Updated : 18/04/01 updated for new wscons
45 #include "opt_compat.h"
47 #include "opt_platform.h"
48 #include "opt_sched.h"
49 #include "opt_timer.h"
51 #include <sys/cdefs.h>
52 __FBSDID("$FreeBSD$");
54 #include <sys/param.h>
56 #include <sys/systm.h>
63 #include <sys/imgact.h>
65 #include <sys/kernel.h>
67 #include <sys/linker.h>
69 #include <sys/malloc.h>
70 #include <sys/msgbuf.h>
71 #include <sys/mutex.h>
73 #include <sys/ptrace.h>
74 #include <sys/rwlock.h>
75 #include <sys/sched.h>
76 #include <sys/signalvar.h>
77 #include <sys/syscallsubr.h>
78 #include <sys/sysctl.h>
79 #include <sys/sysent.h>
80 #include <sys/sysproto.h>
85 #include <vm/vm_map.h>
86 #include <vm/vm_object.h>
87 #include <vm/vm_page.h>
88 #include <vm/vm_pager.h>
90 #include <machine/armreg.h>
91 #include <machine/atags.h>
92 #include <machine/cpu.h>
93 #include <machine/cpuinfo.h>
94 #include <machine/devmap.h>
95 #include <machine/frame.h>
96 #include <machine/intr.h>
97 #include <machine/machdep.h>
98 #include <machine/md_var.h>
99 #include <machine/metadata.h>
100 #include <machine/pcb.h>
101 #include <machine/physmem.h>
102 #include <machine/reg.h>
103 #include <machine/trap.h>
104 #include <machine/undefined.h>
105 #include <machine/vfp.h>
106 #include <machine/vmparam.h>
107 #include <machine/sysarch.h>
110 #include <dev/fdt/fdt_common.h>
111 #include <dev/ofw/openfirm.h>
115 #define debugf(fmt, args...) printf(fmt, ##args)
117 #define debugf(fmt, args...)
120 struct pcpu __pcpu[MAXCPU];
121 struct pcpu *pcpup = &__pcpu[0];
123 static struct trapframe proc0_tf;
124 uint32_t cpu_reset_address = 0;
126 vm_offset_t vector_page;
128 int (*_arm_memcpy)(void *, void *, int, int) = NULL;
129 int (*_arm_bzero)(void *, int, int) = NULL;
130 int _min_memcpy_size = 0;
131 int _min_bzero_size = 0;
135 extern vm_offset_t ksym_start, ksym_end;
140 * This is the number of L2 page tables required for covering max
141 * (hypothetical) memsize of 4GB and all kernel mappings (vectors, msgbuf,
142 * stacks etc.), uprounded to be divisible by 4.
144 #define KERNEL_PT_MAX 78
146 static struct pv_addr kernel_pt_table[KERNEL_PT_MAX];
150 struct pv_addr systempage;
151 static struct pv_addr msgbufpv;
152 struct pv_addr irqstack;
153 struct pv_addr undstack;
154 struct pv_addr abtstack;
155 static struct pv_addr kernelstack;
159 #if defined(LINUX_BOOT_ABI)
160 #define LBABI_MAX_BANKS 10
163 struct arm_lbabi_tag *atag_list;
164 char linux_command_line[LBABI_MAX_COMMAND_LINE + 1];
165 char atags[LBABI_MAX_COMMAND_LINE * 2];
166 uint32_t memstart[LBABI_MAX_BANKS];
167 uint32_t memsize[LBABI_MAX_BANKS];
171 static uint32_t board_revision;
172 /* hex representation of uint64_t */
173 static char board_serial[32];
175 SYSCTL_NODE(_hw, OID_AUTO, board, CTLFLAG_RD, 0, "Board attributes");
176 SYSCTL_UINT(_hw_board, OID_AUTO, revision, CTLFLAG_RD,
177 &board_revision, 0, "Board revision");
178 SYSCTL_STRING(_hw_board, OID_AUTO, serial, CTLFLAG_RD,
179 board_serial, 0, "Board serial");
182 SYSCTL_INT(_hw, HW_FLOATINGPT, floatingpoint, CTLFLAG_RD,
183 &vfp_exists, 0, "Floating point support enabled");
186 board_set_serial(uint64_t serial)
189 snprintf(board_serial, sizeof(board_serial)-1,
194 board_set_revision(uint32_t revision)
197 board_revision = revision;
201 sendsig(catcher, ksi, mask)
208 struct trapframe *tf;
209 struct sigframe *fp, frame;
217 PROC_LOCK_ASSERT(p, MA_OWNED);
218 sig = ksi->ksi_signo;
219 code = ksi->ksi_code;
221 mtx_assert(&psp->ps_mtx, MA_OWNED);
223 onstack = sigonstack(tf->tf_usr_sp);
225 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
228 /* Allocate and validate space for the signal handler context. */
229 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !(onstack) &&
230 SIGISMEMBER(psp->ps_sigonstack, sig)) {
231 fp = (struct sigframe *)(td->td_sigstk.ss_sp +
232 td->td_sigstk.ss_size);
233 #if defined(COMPAT_43)
234 td->td_sigstk.ss_flags |= SS_ONSTACK;
237 fp = (struct sigframe *)td->td_frame->tf_usr_sp;
239 /* make room on the stack */
242 /* make the stack aligned */
243 fp = (struct sigframe *)STACKALIGN(fp);
244 /* Populate the siginfo frame. */
245 get_mcontext(td, &frame.sf_uc.uc_mcontext, 0);
246 frame.sf_si = ksi->ksi_info;
247 frame.sf_uc.uc_sigmask = *mask;
248 frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK )
249 ? ((onstack) ? SS_ONSTACK : 0) : SS_DISABLE;
250 frame.sf_uc.uc_stack = td->td_sigstk;
251 mtx_unlock(&psp->ps_mtx);
252 PROC_UNLOCK(td->td_proc);
254 /* Copy the sigframe out to the user's stack. */
255 if (copyout(&frame, fp, sizeof(*fp)) != 0) {
256 /* Process has trashed its stack. Kill it. */
257 CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp);
263 * Build context to run handler in. We invoke the handler
264 * directly, only returning via the trampoline. Note the
265 * trampoline version numbers are coordinated with machine-
266 * dependent code in libc.
270 tf->tf_r1 = (register_t)&fp->sf_si;
271 tf->tf_r2 = (register_t)&fp->sf_uc;
273 /* the trampoline uses r5 as the uc address */
274 tf->tf_r5 = (register_t)&fp->sf_uc;
275 tf->tf_pc = (register_t)catcher;
276 tf->tf_usr_sp = (register_t)fp;
277 tf->tf_usr_lr = (register_t)(PS_STRINGS - *(p->p_sysent->sv_szsigcode));
279 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_usr_lr,
283 mtx_lock(&psp->ps_mtx);
286 struct kva_md_info kmi;
291 * Initialize the vector page, and select whether or not to
292 * relocate the vectors.
294 * NOTE: We expect the vector page to be mapped at its expected
298 extern unsigned int page0[], page0_data[];
300 arm_vector_init(vm_offset_t va, int which)
302 unsigned int *vectors = (int *) va;
303 unsigned int *vectors_data = vectors + (page0_data - page0);
307 * Loop through the vectors we're taking over, and copy the
308 * vector's insn and data word.
310 for (vec = 0; vec < ARM_NVEC; vec++) {
311 if ((which & (1 << vec)) == 0) {
312 /* Don't want to take over this vector. */
315 vectors[vec] = page0[vec];
316 vectors_data[vec] = page0_data[vec];
319 /* Now sync the vectors. */
320 cpu_icache_sync_range(va, (ARM_NVEC * 2) * sizeof(u_int));
324 if (va == ARM_VECTORS_HIGH) {
326 * Assume the MD caller knows what it's doing here, and
327 * really does want the vector page relocated.
329 * Note: This has to be done here (and not just in
330 * cpu_setup()) because the vector page needs to be
331 * accessible *before* cpu_startup() is called.
334 * NOTE: If the CPU control register is not readable,
335 * this will totally fail! We'll just assume that
336 * any system that has high vector support has a
337 * readable CPU control register, for now. If we
338 * ever encounter one that does not, we'll have to
341 cpu_control(CPU_CONTROL_VECRELOC, CPU_CONTROL_VECRELOC);
346 cpu_startup(void *dummy)
348 struct pcb *pcb = thread0.td_pcb;
349 const unsigned int mbyte = 1024 * 1024;
350 #ifdef ARM_TP_ADDRESS
351 #ifndef ARM_CACHE_LOCK_ENABLE
358 vm_ksubmap_init(&kmi);
361 * Display the RAM layout.
363 printf("real memory = %ju (%ju MB)\n",
364 (uintmax_t)arm32_ptob(realmem),
365 (uintmax_t)arm32_ptob(realmem) / mbyte);
366 printf("avail memory = %ju (%ju MB)\n",
367 (uintmax_t)arm32_ptob(cnt.v_free_count),
368 (uintmax_t)arm32_ptob(cnt.v_free_count) / mbyte);
370 arm_physmem_print_tables();
371 arm_devmap_print_table();
375 vm_pager_bufferinit();
376 pcb->pcb_regs.sf_sp = (u_int)thread0.td_kstack +
377 USPACE_SVC_STACK_TOP;
378 vector_page_setprot(VM_PROT_READ);
379 pmap_set_pcb_pagedir(pmap_kernel(), pcb);
381 #ifdef ARM_TP_ADDRESS
382 #ifdef ARM_CACHE_LOCK_ENABLE
383 pmap_kenter_user(ARM_TP_ADDRESS, ARM_TP_ADDRESS);
384 arm_lock_cache_line(ARM_TP_ADDRESS);
386 m = vm_page_alloc(NULL, 0, VM_ALLOC_NOOBJ | VM_ALLOC_ZERO);
387 pmap_kenter_user(ARM_TP_ADDRESS, VM_PAGE_TO_PHYS(m));
389 *(uint32_t *)ARM_RAS_START = 0;
390 *(uint32_t *)ARM_RAS_END = 0xffffffff;
394 SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
397 * Flush the D-cache for non-DMA I/O so that the I-cache can
398 * be made coherent later.
401 cpu_flush_dcache(void *ptr, size_t len)
404 cpu_dcache_wb_range((uintptr_t)ptr, len);
406 cpu_l2cache_wb_range((uintptr_t)vtophys(ptr), len);
408 cpu_l2cache_wb_range((uintptr_t)ptr, len);
412 /* Get current clock frequency for the given cpu id. */
414 cpu_est_clockrate(int cpu_id, uint64_t *rate)
424 CTR2(KTR_SPARE2, "cpu_idle(%d) at %d", busy, curcpu);
426 #ifndef NO_EVENTTIMERS
430 if (!sched_runnable())
432 #ifndef NO_EVENTTIMERS
437 CTR2(KTR_SPARE2, "cpu_idle(%d) at %d done", busy, curcpu);
441 cpu_idle_wakeup(int cpu)
448 * Most ARM platforms don't need to do anything special to init their clocks
449 * (they get intialized during normal device attachment), and by not defining a
450 * cpu_initclocks() function they get this generic one. Any platform that needs
451 * to do something special can just provide their own implementation, which will
452 * override this one due to the weak linkage.
455 arm_generic_initclocks(void)
458 #ifndef NO_EVENTTIMERS
460 if (PCPU_GET(cpuid) == 0)
461 cpu_initclocks_bsp();
465 cpu_initclocks_bsp();
469 __weak_reference(arm_generic_initclocks, cpu_initclocks);
472 fill_regs(struct thread *td, struct reg *regs)
474 struct trapframe *tf = td->td_frame;
475 bcopy(&tf->tf_r0, regs->r, sizeof(regs->r));
476 regs->r_sp = tf->tf_usr_sp;
477 regs->r_lr = tf->tf_usr_lr;
478 regs->r_pc = tf->tf_pc;
479 regs->r_cpsr = tf->tf_spsr;
483 fill_fpregs(struct thread *td, struct fpreg *regs)
485 bzero(regs, sizeof(*regs));
490 set_regs(struct thread *td, struct reg *regs)
492 struct trapframe *tf = td->td_frame;
494 bcopy(regs->r, &tf->tf_r0, sizeof(regs->r));
495 tf->tf_usr_sp = regs->r_sp;
496 tf->tf_usr_lr = regs->r_lr;
497 tf->tf_pc = regs->r_pc;
498 tf->tf_spsr &= ~PSR_FLAGS;
499 tf->tf_spsr |= regs->r_cpsr & PSR_FLAGS;
504 set_fpregs(struct thread *td, struct fpreg *regs)
510 fill_dbregs(struct thread *td, struct dbreg *regs)
515 set_dbregs(struct thread *td, struct dbreg *regs)
522 ptrace_read_int(struct thread *td, vm_offset_t addr, u_int32_t *v)
527 PROC_LOCK_ASSERT(td->td_proc, MA_NOTOWNED);
528 iov.iov_base = (caddr_t) v;
529 iov.iov_len = sizeof(u_int32_t);
532 uio.uio_offset = (off_t)addr;
533 uio.uio_resid = sizeof(u_int32_t);
534 uio.uio_segflg = UIO_SYSSPACE;
535 uio.uio_rw = UIO_READ;
537 return proc_rwmem(td->td_proc, &uio);
541 ptrace_write_int(struct thread *td, vm_offset_t addr, u_int32_t v)
546 PROC_LOCK_ASSERT(td->td_proc, MA_NOTOWNED);
547 iov.iov_base = (caddr_t) &v;
548 iov.iov_len = sizeof(u_int32_t);
551 uio.uio_offset = (off_t)addr;
552 uio.uio_resid = sizeof(u_int32_t);
553 uio.uio_segflg = UIO_SYSSPACE;
554 uio.uio_rw = UIO_WRITE;
556 return proc_rwmem(td->td_proc, &uio);
560 ptrace_single_step(struct thread *td)
565 KASSERT(td->td_md.md_ptrace_instr == 0,
566 ("Didn't clear single step"));
569 error = ptrace_read_int(td, td->td_frame->tf_pc + 4,
570 &td->td_md.md_ptrace_instr);
573 error = ptrace_write_int(td, td->td_frame->tf_pc + 4,
576 td->td_md.md_ptrace_instr = 0;
577 td->td_md.md_ptrace_addr = td->td_frame->tf_pc + 4;
584 ptrace_clear_single_step(struct thread *td)
588 if (td->td_md.md_ptrace_instr) {
591 ptrace_write_int(td, td->td_md.md_ptrace_addr,
592 td->td_md.md_ptrace_instr);
594 td->td_md.md_ptrace_instr = 0;
600 ptrace_set_pc(struct thread *td, unsigned long addr)
602 td->td_frame->tf_pc = addr;
607 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
618 if (td->td_md.md_spinlock_count == 0) {
619 cspr = disable_interrupts(PSR_I | PSR_F);
620 td->td_md.md_spinlock_count = 1;
621 td->td_md.md_saved_cspr = cspr;
623 td->td_md.md_spinlock_count++;
635 cspr = td->td_md.md_saved_cspr;
636 td->td_md.md_spinlock_count--;
637 if (td->td_md.md_spinlock_count == 0)
638 restore_interrupts(cspr);
642 * Clear registers on exec
645 exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
647 struct trapframe *tf = td->td_frame;
649 memset(tf, 0, sizeof(*tf));
650 tf->tf_usr_sp = stack;
651 tf->tf_usr_lr = imgp->entry_addr;
652 tf->tf_svc_lr = 0x77777777;
653 tf->tf_pc = imgp->entry_addr;
654 tf->tf_spsr = PSR_USR32_MODE;
658 * Get machine context.
661 get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
663 struct trapframe *tf = td->td_frame;
664 __greg_t *gr = mcp->__gregs;
666 if (clear_ret & GET_MC_CLEAR_RET)
669 gr[_REG_R0] = tf->tf_r0;
670 gr[_REG_R1] = tf->tf_r1;
671 gr[_REG_R2] = tf->tf_r2;
672 gr[_REG_R3] = tf->tf_r3;
673 gr[_REG_R4] = tf->tf_r4;
674 gr[_REG_R5] = tf->tf_r5;
675 gr[_REG_R6] = tf->tf_r6;
676 gr[_REG_R7] = tf->tf_r7;
677 gr[_REG_R8] = tf->tf_r8;
678 gr[_REG_R9] = tf->tf_r9;
679 gr[_REG_R10] = tf->tf_r10;
680 gr[_REG_R11] = tf->tf_r11;
681 gr[_REG_R12] = tf->tf_r12;
682 gr[_REG_SP] = tf->tf_usr_sp;
683 gr[_REG_LR] = tf->tf_usr_lr;
684 gr[_REG_PC] = tf->tf_pc;
685 gr[_REG_CPSR] = tf->tf_spsr;
691 * Set machine context.
693 * However, we don't set any but the user modifiable flags, and we won't
694 * touch the cs selector.
697 set_mcontext(struct thread *td, mcontext_t *mcp)
699 struct trapframe *tf = td->td_frame;
700 const __greg_t *gr = mcp->__gregs;
702 tf->tf_r0 = gr[_REG_R0];
703 tf->tf_r1 = gr[_REG_R1];
704 tf->tf_r2 = gr[_REG_R2];
705 tf->tf_r3 = gr[_REG_R3];
706 tf->tf_r4 = gr[_REG_R4];
707 tf->tf_r5 = gr[_REG_R5];
708 tf->tf_r6 = gr[_REG_R6];
709 tf->tf_r7 = gr[_REG_R7];
710 tf->tf_r8 = gr[_REG_R8];
711 tf->tf_r9 = gr[_REG_R9];
712 tf->tf_r10 = gr[_REG_R10];
713 tf->tf_r11 = gr[_REG_R11];
714 tf->tf_r12 = gr[_REG_R12];
715 tf->tf_usr_sp = gr[_REG_SP];
716 tf->tf_usr_lr = gr[_REG_LR];
717 tf->tf_pc = gr[_REG_PC];
718 tf->tf_spsr = gr[_REG_CPSR];
727 sys_sigreturn(td, uap)
729 struct sigreturn_args /* {
730 const struct __ucontext *sigcntxp;
738 if (copyin(uap->sigcntxp, &uc, sizeof(uc)))
741 * Make sure the processor mode has not been tampered with and
742 * interrupts have not been disabled.
744 spsr = uc.uc_mcontext.__gregs[_REG_CPSR];
745 if ((spsr & PSR_MODE) != PSR_USR32_MODE ||
746 (spsr & (PSR_I | PSR_F)) != 0)
748 /* Restore register context. */
749 set_mcontext(td, &uc.uc_mcontext);
751 /* Restore signal mask. */
752 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0);
754 return (EJUSTRETURN);
759 * Construct a PCB from a trapframe. This is called from kdb_trap() where
760 * we want to start a backtrace from the function that caused us to enter
761 * the debugger. We have the context in the trapframe, but base the trace
762 * on the PCB. The PCB doesn't have to be perfect, as long as it contains
763 * enough for a backtrace.
766 makectx(struct trapframe *tf, struct pcb *pcb)
768 pcb->pcb_regs.sf_r4 = tf->tf_r4;
769 pcb->pcb_regs.sf_r5 = tf->tf_r5;
770 pcb->pcb_regs.sf_r6 = tf->tf_r6;
771 pcb->pcb_regs.sf_r7 = tf->tf_r7;
772 pcb->pcb_regs.sf_r8 = tf->tf_r8;
773 pcb->pcb_regs.sf_r9 = tf->tf_r9;
774 pcb->pcb_regs.sf_r10 = tf->tf_r10;
775 pcb->pcb_regs.sf_r11 = tf->tf_r11;
776 pcb->pcb_regs.sf_r12 = tf->tf_r12;
777 pcb->pcb_regs.sf_pc = tf->tf_pc;
778 pcb->pcb_regs.sf_lr = tf->tf_usr_lr;
779 pcb->pcb_regs.sf_sp = tf->tf_usr_sp;
783 * Fake up a boot descriptor table
786 fake_preload_metadata(struct arm_boot_params *abp __unused)
789 vm_offset_t zstart = 0, zend = 0;
791 vm_offset_t lastaddr;
793 static uint32_t fake_preload[35];
795 fake_preload[i++] = MODINFO_NAME;
796 fake_preload[i++] = strlen("kernel") + 1;
797 strcpy((char*)&fake_preload[i++], "kernel");
799 fake_preload[i++] = MODINFO_TYPE;
800 fake_preload[i++] = strlen("elf kernel") + 1;
801 strcpy((char*)&fake_preload[i++], "elf kernel");
803 fake_preload[i++] = MODINFO_ADDR;
804 fake_preload[i++] = sizeof(vm_offset_t);
805 fake_preload[i++] = KERNVIRTADDR;
806 fake_preload[i++] = MODINFO_SIZE;
807 fake_preload[i++] = sizeof(uint32_t);
808 fake_preload[i++] = (uint32_t)&end - KERNVIRTADDR;
810 if (*(uint32_t *)KERNVIRTADDR == MAGIC_TRAMP_NUMBER) {
811 fake_preload[i++] = MODINFO_METADATA|MODINFOMD_SSYM;
812 fake_preload[i++] = sizeof(vm_offset_t);
813 fake_preload[i++] = *(uint32_t *)(KERNVIRTADDR + 4);
814 fake_preload[i++] = MODINFO_METADATA|MODINFOMD_ESYM;
815 fake_preload[i++] = sizeof(vm_offset_t);
816 fake_preload[i++] = *(uint32_t *)(KERNVIRTADDR + 8);
817 lastaddr = *(uint32_t *)(KERNVIRTADDR + 8);
819 zstart = *(uint32_t *)(KERNVIRTADDR + 4);
824 lastaddr = (vm_offset_t)&end;
825 fake_preload[i++] = 0;
827 preload_metadata = (void *)fake_preload;
829 init_static_kenv(NULL, 0);
838 set_curthread(&thread0);
840 pcpu_init(pcpup, 0, sizeof(struct pcpu));
841 PCPU_SET(curthread, &thread0);
847 #if defined(LINUX_BOOT_ABI)
849 linux_parse_boot_param(struct arm_boot_params *abp)
851 struct arm_lbabi_tag *walker;
856 * Linux boot ABI: r0 = 0, r1 is the board type (!= 0) and r2
857 * is atags or dtb pointer. If all of these aren't satisfied,
860 if (!(abp->abp_r0 == 0 && abp->abp_r1 != 0 && abp->abp_r2 != 0))
863 board_id = abp->abp_r1;
864 walker = (struct arm_lbabi_tag *)
865 (abp->abp_r2 + KERNVIRTADDR - abp->abp_physaddr);
867 /* xxx - Need to also look for binary device tree */
868 if (ATAG_TAG(walker) != ATAG_CORE)
872 while (ATAG_TAG(walker) != ATAG_NONE) {
873 switch (ATAG_TAG(walker)) {
877 arm_physmem_hardware_region(walker->u.tag_mem.start,
878 walker->u.tag_mem.size);
883 serial = walker->u.tag_sn.low |
884 ((uint64_t)walker->u.tag_sn.high << 32);
885 board_set_serial(serial);
888 revision = walker->u.tag_rev.rev;
889 board_set_revision(revision);
892 /* XXX open question: Parse this for boothowto? */
893 bcopy(walker->u.tag_cmd.command, linux_command_line,
899 walker = ATAG_NEXT(walker);
902 /* Save a copy for later */
903 bcopy(atag_list, atags,
904 (char *)walker - (char *)atag_list + ATAG_SIZE(walker));
906 init_static_kenv(NULL, 0);
908 return fake_preload_metadata(abp);
912 #if defined(FREEBSD_BOOT_LOADER)
914 freebsd_parse_boot_param(struct arm_boot_params *abp)
916 vm_offset_t lastaddr = 0;
921 * Mask metadata pointer: it is supposed to be on page boundary. If
922 * the first argument (mdp) doesn't point to a valid address the
923 * bootloader must have passed us something else than the metadata
924 * ptr, so we give up. Also give up if we cannot find metadta section
925 * the loader creates that we get all this data out of.
928 if ((mdp = (void *)(abp->abp_r0 & ~PAGE_MASK)) == NULL)
930 preload_metadata = mdp;
931 kmdp = preload_search_by_type("elf kernel");
935 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
936 init_static_kenv(MD_FETCH(kmdp, MODINFOMD_ENVP, char *), 0);
937 lastaddr = MD_FETCH(kmdp, MODINFOMD_KERNEND, vm_offset_t);
939 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t);
940 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t);
947 default_parse_boot_param(struct arm_boot_params *abp)
949 vm_offset_t lastaddr;
951 #if defined(LINUX_BOOT_ABI)
952 if ((lastaddr = linux_parse_boot_param(abp)) != 0)
955 #if defined(FREEBSD_BOOT_LOADER)
956 if ((lastaddr = freebsd_parse_boot_param(abp)) != 0)
959 /* Fall back to hardcoded metadata. */
960 lastaddr = fake_preload_metadata(abp);
966 * Stub version of the boot parameter parsing routine. We are
967 * called early in initarm, before even VM has been initialized.
968 * This routine needs to preserve any data that the boot loader
969 * has passed in before the kernel starts to grow past the end
970 * of the BSS, traditionally the place boot-loaders put this data.
972 * Since this is called so early, things that depend on the vm system
973 * being setup (including access to some SoC's serial ports), about
974 * all that can be done in this routine is to copy the arguments.
976 * This is the default boot parameter parsing routine. Individual
977 * kernels/boards can override this weak function with one of their
978 * own. We just fake metadata...
980 __weak_reference(default_parse_boot_param, parse_boot_param);
986 init_proc0(vm_offset_t kstack)
988 proc_linkup0(&proc0, &thread0);
989 thread0.td_kstack = kstack;
990 thread0.td_pcb = (struct pcb *)
991 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1;
992 thread0.td_pcb->pcb_flags = 0;
993 thread0.td_pcb->pcb_vfpcpu = -1;
994 thread0.td_pcb->pcb_vfpstate.fpscr = VFPSCR_DN | VFPSCR_FZ;
995 thread0.td_frame = &proc0_tf;
996 pcpup->pc_curpcb = thread0.td_pcb;
1000 set_stackptrs(int cpu)
1003 set_stackptr(PSR_IRQ32_MODE,
1004 irqstack.pv_va + ((IRQ_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
1005 set_stackptr(PSR_ABT32_MODE,
1006 abtstack.pv_va + ((ABT_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
1007 set_stackptr(PSR_UND32_MODE,
1008 undstack.pv_va + ((UND_STACK_SIZE * PAGE_SIZE) * (cpu + 1)));
1032 debugf("loader passed (static) kenv:\n");
1033 if (kern_envp == NULL) {
1034 debugf(" no env, null ptr\n");
1037 debugf(" kern_envp = 0x%08x\n", (uint32_t)kern_envp);
1040 for (cp = kern_envp; cp != NULL; cp = kenv_next(cp))
1041 debugf(" %x %s\n", (uint32_t)cp, cp);
1045 initarm(struct arm_boot_params *abp)
1047 struct mem_region mem_regions[FDT_MEM_REGIONS];
1048 struct pv_addr kernel_l1pt;
1049 struct pv_addr dpcpu;
1050 vm_offset_t dtbp, freemempos, l2_start, lastaddr;
1051 uint32_t memsize, l2size;
1055 int i, j, err_devmap, mem_regions_sz;
1057 lastaddr = parse_boot_param(abp);
1058 arm_physmem_kernaddr = abp->abp_physaddr;
1066 * Find the dtb passed in by the boot loader.
1068 kmdp = preload_search_by_type("elf kernel");
1070 dtbp = MD_FETCH(kmdp, MODINFOMD_DTBP, vm_offset_t);
1072 dtbp = (vm_offset_t)NULL;
1074 #if defined(FDT_DTB_STATIC)
1076 * In case the device tree blob was not retrieved (from metadata) try
1077 * to use the statically embedded one.
1079 if (dtbp == (vm_offset_t)NULL)
1080 dtbp = (vm_offset_t)&fdt_static_dtb;
1083 if (OF_install(OFW_FDT, 0) == FALSE)
1084 panic("Cannot install FDT");
1086 if (OF_init((void *)dtbp) != 0)
1087 panic("OF_init failed with the found device tree");
1089 /* Grab physical memory regions information from device tree. */
1090 if (fdt_get_mem_regions(mem_regions, &mem_regions_sz, &memsize) != 0)
1091 panic("Cannot get physical memory regions");
1092 arm_physmem_hardware_regions(mem_regions, mem_regions_sz);
1094 /* Grab reserved memory regions information from device tree. */
1095 if (fdt_get_reserved_regions(mem_regions, &mem_regions_sz) == 0)
1096 arm_physmem_exclude_regions(mem_regions, mem_regions_sz,
1097 EXFLAG_NODUMP | EXFLAG_NOALLOC);
1099 /* Platform-specific initialisation */
1100 initarm_early_init();
1104 /* Do basic tuning, hz etc */
1107 /* Calculate number of L2 tables needed for mapping vm_page_array */
1108 l2size = (memsize / PAGE_SIZE) * sizeof(struct vm_page);
1109 l2size = (l2size >> L1_S_SHIFT) + 1;
1112 * Add one table for end of kernel map, one for stacks, msgbuf and
1113 * L1 and L2 tables map and one for vectors map.
1117 /* Make it divisible by 4 */
1118 l2size = (l2size + 3) & ~3;
1120 freemempos = (lastaddr + PAGE_MASK) & ~PAGE_MASK;
1122 /* Define a macro to simplify memory allocation */
1123 #define valloc_pages(var, np) \
1124 alloc_pages((var).pv_va, (np)); \
1125 (var).pv_pa = (var).pv_va + (abp->abp_physaddr - KERNVIRTADDR);
1127 #define alloc_pages(var, np) \
1128 (var) = freemempos; \
1129 freemempos += (np * PAGE_SIZE); \
1130 memset((char *)(var), 0, ((np) * PAGE_SIZE));
1132 while (((freemempos - L1_TABLE_SIZE) & (L1_TABLE_SIZE - 1)) != 0)
1133 freemempos += PAGE_SIZE;
1134 valloc_pages(kernel_l1pt, L1_TABLE_SIZE / PAGE_SIZE);
1136 for (i = 0, j = 0; i < l2size; ++i) {
1137 if (!(i % (PAGE_SIZE / L2_TABLE_SIZE_REAL))) {
1138 valloc_pages(kernel_pt_table[i],
1139 L2_TABLE_SIZE / PAGE_SIZE);
1142 kernel_pt_table[i].pv_va = kernel_pt_table[j].pv_va +
1143 L2_TABLE_SIZE_REAL * (i - j);
1144 kernel_pt_table[i].pv_pa =
1145 kernel_pt_table[i].pv_va - KERNVIRTADDR +
1151 * Allocate a page for the system page mapped to 0x00000000
1152 * or 0xffff0000. This page will just contain the system vectors
1153 * and can be shared by all processes.
1155 valloc_pages(systempage, 1);
1157 /* Allocate dynamic per-cpu area. */
1158 valloc_pages(dpcpu, DPCPU_SIZE / PAGE_SIZE);
1159 dpcpu_init((void *)dpcpu.pv_va, 0);
1161 /* Allocate stacks for all modes */
1162 valloc_pages(irqstack, IRQ_STACK_SIZE * MAXCPU);
1163 valloc_pages(abtstack, ABT_STACK_SIZE * MAXCPU);
1164 valloc_pages(undstack, UND_STACK_SIZE * MAXCPU);
1165 valloc_pages(kernelstack, KSTACK_PAGES * MAXCPU);
1166 valloc_pages(msgbufpv, round_page(msgbufsize) / PAGE_SIZE);
1169 * Now we start construction of the L1 page table
1170 * We start by mapping the L2 page tables into the L1.
1171 * This means that we can replace L1 mappings later on if necessary
1173 l1pagetable = kernel_l1pt.pv_va;
1176 * Try to map as much as possible of kernel text and data using
1177 * 1MB section mapping and for the rest of initial kernel address
1178 * space use L2 coarse tables.
1180 * Link L2 tables for mapping remainder of kernel (modulo 1MB)
1181 * and kernel structures
1183 l2_start = lastaddr & ~(L1_S_OFFSET);
1184 for (i = 0 ; i < l2size - 1; i++)
1185 pmap_link_l2pt(l1pagetable, l2_start + i * L1_S_SIZE,
1186 &kernel_pt_table[i]);
1188 pmap_curmaxkvaddr = l2_start + (l2size - 1) * L1_S_SIZE;
1190 /* Map kernel code and data */
1191 pmap_map_chunk(l1pagetable, KERNVIRTADDR, abp->abp_physaddr,
1192 (((uint32_t)(lastaddr) - KERNVIRTADDR) + PAGE_MASK) & ~PAGE_MASK,
1193 VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
1195 /* Map L1 directory and allocated L2 page tables */
1196 pmap_map_chunk(l1pagetable, kernel_l1pt.pv_va, kernel_l1pt.pv_pa,
1197 L1_TABLE_SIZE, VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
1199 pmap_map_chunk(l1pagetable, kernel_pt_table[0].pv_va,
1200 kernel_pt_table[0].pv_pa,
1201 L2_TABLE_SIZE_REAL * l2size,
1202 VM_PROT_READ|VM_PROT_WRITE, PTE_PAGETABLE);
1204 /* Map allocated DPCPU, stacks and msgbuf */
1205 pmap_map_chunk(l1pagetable, dpcpu.pv_va, dpcpu.pv_pa,
1206 freemempos - dpcpu.pv_va,
1207 VM_PROT_READ|VM_PROT_WRITE, PTE_CACHE);
1209 /* Link and map the vector page */
1210 pmap_link_l2pt(l1pagetable, ARM_VECTORS_HIGH,
1211 &kernel_pt_table[l2size - 1]);
1212 pmap_map_entry(l1pagetable, ARM_VECTORS_HIGH, systempage.pv_pa,
1213 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE, PTE_CACHE);
1215 /* Establish static device mappings. */
1216 err_devmap = initarm_devmap_init();
1217 arm_devmap_bootstrap(l1pagetable, NULL);
1218 vm_max_kernel_address = initarm_lastaddr();
1220 cpu_domains((DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL * 2)) | DOMAIN_CLIENT);
1221 pmap_pa = kernel_l1pt.pv_pa;
1222 setttb(kernel_l1pt.pv_pa);
1224 cpu_domains(DOMAIN_CLIENT << (PMAP_DOMAIN_KERNEL * 2));
1227 * Now that proper page tables are installed, call cpu_setup() to enable
1228 * instruction and data caches and other chip-specific features.
1233 * Only after the SOC registers block is mapped we can perform device
1234 * tree fixups, as they may attempt to read parameters from hardware.
1236 OF_interpret("perform-fixup", 0);
1238 initarm_gpio_init();
1242 debugf("initarm: console initialized\n");
1243 debugf(" arg1 kmdp = 0x%08x\n", (uint32_t)kmdp);
1244 debugf(" boothowto = 0x%08x\n", boothowto);
1245 debugf(" dtbp = 0x%08x\n", (uint32_t)dtbp);
1248 env = getenv("kernelname");
1250 strlcpy(kernelname, env, sizeof(kernelname));
1252 if (err_devmap != 0)
1253 printf("WARNING: could not fully configure devmap, error=%d\n",
1256 initarm_late_init();
1259 * Pages were allocated during the secondary bootstrap for the
1260 * stacks for different CPU modes.
1261 * We must now set the r13 registers in the different CPU modes to
1262 * point to these stacks.
1263 * Since the ARM stacks use STMFD etc. we must set r13 to the top end
1264 * of the stack memory.
1266 cpu_control(CPU_CONTROL_MMU_ENABLE, CPU_CONTROL_MMU_ENABLE);
1271 * We must now clean the cache again....
1272 * Cleaning may be done by reading new data to displace any
1273 * dirty data in the cache. This will have happened in setttb()
1274 * but since we are boot strapping the addresses used for the read
1275 * may have just been remapped and thus the cache could be out
1276 * of sync. A re-clean after the switch will cure this.
1277 * After booting there are no gross relocations of the kernel thus
1278 * this problem will not occur after initarm().
1280 cpu_idcache_wbinv_all();
1284 init_proc0(kernelstack.pv_va);
1286 arm_vector_init(ARM_VECTORS_HIGH, ARM_VEC_ALL);
1287 pmap_bootstrap(freemempos, &kernel_l1pt);
1288 msgbufp = (void *)msgbufpv.pv_va;
1289 msgbufinit(msgbufp, msgbufsize);
1293 * Exclude the kernel (and all the things we allocated which immediately
1294 * follow the kernel) from the VM allocation pool but not from crash
1295 * dumps. virtual_avail is a global variable which tracks the kva we've
1296 * "allocated" while setting up pmaps.
1298 * Prepare the list of physical memory available to the vm subsystem.
1300 arm_physmem_exclude_region(abp->abp_physaddr,
1301 (virtual_avail - KERNVIRTADDR), EXFLAG_NOALLOC);
1302 arm_physmem_init_kernel_globals();
1304 init_param2(physmem);
1307 return ((void *)(kernelstack.pv_va + USPACE_SVC_STACK_TOP -
1308 sizeof(struct pcb)));