2 * Copyright (c) 2014 Andrew Turner
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include "opt_platform.h"
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/limits.h>
37 #include <sys/sf_buf.h>
38 #include <sys/signal.h>
39 #include <sys/sysent.h>
40 #include <sys/unistd.h>
43 #include <vm/vm_page.h>
44 #include <vm/vm_map.h>
46 #include <vm/uma_int.h>
48 #include <machine/armreg.h>
49 #include <machine/cpu.h>
50 #include <machine/md_var.h>
51 #include <machine/pcb.h>
52 #include <machine/frame.h>
55 #include <machine/vfp.h>
58 #include <dev/psci/psci.h>
61 * Finish a fork operation, with process p2 nearly set up.
62 * Copy and update the pcb, set up the stack so that the child
63 * ready to run and return to user mode.
66 cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
71 if ((flags & RFPROC) == 0)
74 if (td1 == curthread) {
76 * Save the tpidr_el0 and the vfp state, these normally happen
77 * in cpu_switch, but if userland changes these then forks
78 * this may not have happened.
80 td1->td_pcb->pcb_tpidr_el0 = READ_SPECIALREG(tpidr_el0);
81 td1->td_pcb->pcb_tpidrro_el0 = READ_SPECIALREG(tpidrro_el0);
83 if ((td1->td_pcb->pcb_fpflags & PCB_FP_STARTED) != 0)
84 vfp_save_state(td1, td1->td_pcb);
88 pcb2 = (struct pcb *)(td2->td_kstack +
89 td2->td_kstack_pages * PAGE_SIZE) - 1;
92 bcopy(td1->td_pcb, pcb2, sizeof(*pcb2));
94 tf = (struct trapframe *)STACKALIGN((struct trapframe *)pcb2 - 1);
95 bcopy(td1->td_frame, tf, sizeof(*tf));
98 tf->tf_spsr = td1->td_frame->tf_spsr & (PSR_M_32 | PSR_DAIF);
102 /* Set the return value registers for fork() */
103 td2->td_pcb->pcb_x[8] = (uintptr_t)fork_return;
104 td2->td_pcb->pcb_x[9] = (uintptr_t)td2;
105 td2->td_pcb->pcb_x[PCB_LR] = (uintptr_t)fork_trampoline;
106 td2->td_pcb->pcb_sp = (uintptr_t)td2->td_frame;
107 td2->td_pcb->pcb_fpusaved = &td2->td_pcb->pcb_fpustate;
108 td2->td_pcb->pcb_vfpcpu = UINT_MAX;
110 /* Setup to release spin count in fork_exit(). */
111 td2->td_md.md_spinlock_count = 1;
112 td2->td_md.md_saved_daif = td1->td_md.md_saved_daif & ~DAIF_I_MASKED;
121 printf("cpu_reset failed");
123 __asm volatile("wfi" ::: "memory");
127 cpu_thread_swapin(struct thread *td)
132 cpu_thread_swapout(struct thread *td)
137 cpu_set_syscall_retval(struct thread *td, int error)
139 struct trapframe *frame;
141 frame = td->td_frame;
145 frame->tf_x[0] = td->td_retval[0];
146 frame->tf_x[1] = td->td_retval[1];
147 frame->tf_spsr &= ~PSR_C; /* carry bit */
155 frame->tf_spsr |= PSR_C; /* carry bit */
156 frame->tf_x[0] = SV_ABI_ERRNO(td->td_proc, error);
162 * Initialize machine state, mostly pcb and trap frame for a new
163 * thread, about to return to userspace. Put enough state in the new
164 * thread's PCB to get it to go back to the fork_return(), which
165 * finalizes the thread state and handles peculiarities of the first
166 * return to userspace for the new thread.
169 cpu_copy_thread(struct thread *td, struct thread *td0)
171 bcopy(td0->td_frame, td->td_frame, sizeof(struct trapframe));
172 bcopy(td0->td_pcb, td->td_pcb, sizeof(struct pcb));
174 td->td_pcb->pcb_x[8] = (uintptr_t)fork_return;
175 td->td_pcb->pcb_x[9] = (uintptr_t)td;
176 td->td_pcb->pcb_x[PCB_LR] = (uintptr_t)fork_trampoline;
177 td->td_pcb->pcb_sp = (uintptr_t)td->td_frame;
178 td->td_pcb->pcb_fpusaved = &td->td_pcb->pcb_fpustate;
179 td->td_pcb->pcb_vfpcpu = UINT_MAX;
181 /* Setup to release spin count in fork_exit(). */
182 td->td_md.md_spinlock_count = 1;
183 td->td_md.md_saved_daif = td0->td_md.md_saved_daif & ~DAIF_I_MASKED;
187 * Set that machine state for performing an upcall that starts
188 * the entry function with the given argument.
191 cpu_set_upcall(struct thread *td, void (*entry)(void *), void *arg,
194 struct trapframe *tf = td->td_frame;
196 /* 32bits processes use r13 for sp */
197 if (td->td_frame->tf_spsr & PSR_M_32)
198 tf->tf_x[13] = STACKALIGN((uintptr_t)stack->ss_sp + stack->ss_size);
200 tf->tf_sp = STACKALIGN((uintptr_t)stack->ss_sp + stack->ss_size);
201 tf->tf_elr = (register_t)entry;
202 tf->tf_x[0] = (register_t)arg;
206 cpu_set_user_tls(struct thread *td, void *tls_base)
210 if ((uintptr_t)tls_base >= VM_MAXUSER_ADDRESS)
214 if (td->td_frame->tf_spsr & PSR_M_32) {
215 /* 32bits arm stores the user TLS into tpidrro */
216 pcb->pcb_tpidrro_el0 = (register_t)tls_base;
217 pcb->pcb_tpidr_el0 = (register_t)tls_base;
218 if (td == curthread) {
219 WRITE_SPECIALREG(tpidrro_el0, tls_base);
220 WRITE_SPECIALREG(tpidr_el0, tls_base);
223 pcb->pcb_tpidr_el0 = (register_t)tls_base;
225 WRITE_SPECIALREG(tpidr_el0, tls_base);
232 cpu_thread_exit(struct thread *td)
237 cpu_thread_alloc(struct thread *td)
240 td->td_pcb = (struct pcb *)(td->td_kstack +
241 td->td_kstack_pages * PAGE_SIZE) - 1;
242 td->td_frame = (struct trapframe *)STACKALIGN(
243 (struct trapframe *)td->td_pcb - 1);
247 cpu_thread_free(struct thread *td)
252 cpu_thread_clean(struct thread *td)
257 * Intercept the return address from a freshly forked process that has NOT
258 * been scheduled yet.
260 * This is needed to make kernel threads stay in kernel mode.
263 cpu_fork_kthread_handler(struct thread *td, void (*func)(void *), void *arg)
266 td->td_pcb->pcb_x[8] = (uintptr_t)func;
267 td->td_pcb->pcb_x[9] = (uintptr_t)arg;
268 td->td_pcb->pcb_x[PCB_LR] = (uintptr_t)fork_trampoline;
269 td->td_pcb->pcb_sp = (uintptr_t)td->td_frame;
270 td->td_pcb->pcb_fpusaved = &td->td_pcb->pcb_fpustate;
271 td->td_pcb->pcb_vfpcpu = UINT_MAX;
275 cpu_exit(struct thread *td)
280 cpu_exec_vmspace_reuse(struct proc *p __unused, vm_map_t map __unused)
287 cpu_procctl(struct thread *td __unused, int idtype __unused, id_t id __unused,
288 int com __unused, void *data __unused)
298 if (busdma_swi_pending != 0)