Date: Wed, 2 May 2012 08:10:16 +0000 (UTC) From: Robert Watson <rwatson@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r234920 - in head/sys: dev/gxemul dev/gxemul/cons mips/conf mips/gxemul Message-ID: <201205020810.q428AGwg073067@svn.freebsd.org>
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Author: rwatson Date: Wed May 2 08:10:15 2012 New Revision: 234920 URL: http://svn.freebsd.org/changeset/base/234920 Log: Merge a rudimentary gxemul "oldtestmips" port. This consists almost entirely of one machdep file lifted from the MALTA port, as well as a low-level console and tty driver for the gxemul debugging console device (the emulators stdio). As with many low-level embedded and hypervisor console devices, it is polled only, so we drive TTY I/O from a callout; we are perhaps a bit too aware of the MIPS physical maps in order to attach the console before newbus comes to life. The sample kernel configuration depends on an MD-based root file system, which is not provided. However, any 64-bit, big-endian userspace image (such as one generated for MALTA) should work. This will hopefully be supplemented by additional device drivers for gxemul-specific hardware simulations from Juli Mallett. We have found oldtestmips quite useful for testing and improving aspects of the MIPS port, so it's worth supporting better in FreeBSD. Requested by: theraven, jmallett Sponsored by: DARPA, AFRL MFC after: 3 weeks Added: head/sys/dev/gxemul/ head/sys/dev/gxemul/cons/ head/sys/dev/gxemul/cons/gxemul_cons.c (contents, props changed) head/sys/mips/conf/GXEMUL (contents, props changed) head/sys/mips/conf/GXEMUL.hints (contents, props changed) head/sys/mips/gxemul/ head/sys/mips/gxemul/files.gxemul (contents, props changed) head/sys/mips/gxemul/gxemul_machdep.c (contents, props changed) head/sys/mips/gxemul/std.gxemul (contents, props changed) Added: head/sys/dev/gxemul/cons/gxemul_cons.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/dev/gxemul/cons/gxemul_cons.c Wed May 2 08:10:15 2012 (r234920) @@ -0,0 +1,334 @@ +/*- + * Copyright (c) 2011-2012 Robert N. M. Watson + * All rights reserved. + * + * This software was developed by SRI International and the University of + * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237) + * ("CTSRD"), as part of the DARPA CRASH research programme. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/cons.h> +#include <sys/endian.h> +#include <sys/kdb.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/tty.h> + +#include <ddb/ddb.h> + +#define GC_LOCK_INIT() mtx_init(&gc_lock, "gc_lock", NULL, MTX_SPIN) + +#define GC_LOCK() do { \ + if (!kdb_active) \ + mtx_lock_spin(&gc_lock); \ +} while (0) + +#define GC_LOCK_ASSERT() do { \ + if (!kdb_active) \ + mtx_assert(&gc_lock, MA_OWNED); \ +} while (0) + +#define GC_UNLOCK() do { \ + if (!kdb_active) \ + mtx_unlock_spin(&gc_lock); \ +} while (0) + + +static struct mtx gc_lock; + +/* + * Low-level console driver functions. + */ +static cn_probe_t gxemul_cons_cnprobe; +static cn_init_t gxemul_cons_cninit; +static cn_term_t gxemul_cons_cnterm; +static cn_getc_t gxemul_cons_cngetc; +static cn_putc_t gxemul_cons_cnputc; +static cn_grab_t gxemul_cons_cngrab; +static cn_ungrab_t gxemul_cons_cnungrab; + +/* + * TTY-level fields. + */ +static tsw_outwakeup_t gxemul_cons_outwakeup; + +static struct ttydevsw gxemul_cons_ttydevsw = { + .tsw_flags = TF_NOPREFIX, + .tsw_outwakeup = gxemul_cons_outwakeup, +}; + +static struct callout gxemul_cons_callout; +static u_int gxemul_cons_polltime = 10; +#ifdef KDB +static int gxemul_cons_alt_break_state; +#endif + +static void gxemul_cons_timeout(void *); + +/* + * I/O routines lifted from Deimos. + * + * XXXRW: Should be using FreeBSD's bus routines here, but they are not + * available until later in the boot. + */ +#define MIPS_XKPHYS_UNCACHED_BASE 0x9000000000000000 + +typedef uint64_t paddr_t; +typedef uint64_t vaddr_t; + +static inline vaddr_t +mips_phys_to_uncached(paddr_t phys) +{ + + return (phys | MIPS_XKPHYS_UNCACHED_BASE); +} + +static inline uint8_t +mips_ioread_uint8(vaddr_t vaddr) +{ + uint8_t v; + + __asm__ __volatile__ ("lbu %0, 0(%1)" : "=r" (v) : "r" (vaddr)); + return (v); +} + +static inline void +mips_iowrite_uint8(vaddr_t vaddr, uint8_t v) +{ + + __asm__ __volatile__ ("sb %0, 0(%1)" : : "r" (v), "r" (vaddr)); +} + +/* + * gxemul-specific constants. + */ +#define GXEMUL_CONS_BASE 0x10000000 /* gxemul console device. */ + +/* + * Routines for interacting with the gxemul test console. Programming details + * are a result of manually inspecting the source code for gxemul's + * dev_cons.cc and dev_cons.h. + * + * Offsets of I/O channels relative to the base. + */ +#define GXEMUL_PUTGETCHAR_OFF 0x00000000 +#define GXEMUL_CONS_HALT 0x00000010 + +/* + * One-byte buffer as we can't check whether the console is readable without + * actually reading from it. + */ +static char buffer_data; +static int buffer_valid; + +/* + * Low-level read and write routines. + */ +static inline uint8_t +gxemul_cons_data_read(void) +{ + + return (mips_ioread_uint8(mips_phys_to_uncached(GXEMUL_CONS_BASE + + GXEMUL_PUTGETCHAR_OFF))); +} + +static inline void +gxemul_cons_data_write(uint8_t v) +{ + + mips_iowrite_uint8(mips_phys_to_uncached(GXEMUL_CONS_BASE + + GXEMUL_PUTGETCHAR_OFF), v); +} + +static int +gxemul_cons_writable(void) +{ + + return (1); +} + +static int +gxemul_cons_readable(void) +{ + uint32_t v; + + GC_LOCK_ASSERT(); + + if (buffer_valid) + return (1); + v = gxemul_cons_data_read(); + if (v != 0) { + buffer_valid = 1; + buffer_data = v; + return (1); + } + return (0); +} + +static void +gxemul_cons_write(char ch) +{ + + GC_LOCK_ASSERT(); + + while (!gxemul_cons_writable()); + gxemul_cons_data_write(ch); +} + +static char +gxemul_cons_read(void) +{ + + GC_LOCK_ASSERT(); + + while (!gxemul_cons_readable()); + buffer_valid = 0; + return (buffer_data); +} + +/* + * Implementation of a FreeBSD low-level, polled console driver. + */ +static void +gxemul_cons_cnprobe(struct consdev *cp) +{ + + sprintf(cp->cn_name, "gxcons"); + cp->cn_pri = CN_NORMAL; +} + +static void +gxemul_cons_cninit(struct consdev *cp) +{ + + GC_LOCK_INIT(); +} + +static void +gxemul_cons_cnterm(struct consdev *cp) +{ + +} + +static int +gxemul_cons_cngetc(struct consdev *cp) +{ + int ret; + + GC_LOCK(); + ret = gxemul_cons_read(); + GC_UNLOCK(); + return (ret); +} + +static void +gxemul_cons_cnputc(struct consdev *cp, int c) +{ + + GC_LOCK(); + gxemul_cons_write(c); + GC_UNLOCK(); +} + +static void +gxemul_cons_cngrab(struct consdev *cp) +{ + +} + +static void +gxemul_cons_cnungrab(struct consdev *cp) +{ + +} + +CONSOLE_DRIVER(gxemul_cons); + +/* + * TTY-level functions for gxemul_cons. + */ +static void +gxemul_cons_ttyinit(void *unused) +{ + struct tty *tp; + + tp = tty_alloc(&gxemul_cons_ttydevsw, NULL); + tty_init_console(tp, 0); + tty_makedev(tp, NULL, "%s", "gxcons"); + callout_init(&gxemul_cons_callout, CALLOUT_MPSAFE); + callout_reset(&gxemul_cons_callout, gxemul_cons_polltime, + gxemul_cons_timeout, tp); + +} +SYSINIT(gxemul_cons_ttyinit, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, + gxemul_cons_ttyinit, NULL); + +static void +gxemul_cons_outwakeup(struct tty *tp) +{ + int len; + u_char ch; + + /* + * XXXRW: Would be nice not to do blocking writes to the console here, + * rescheduling on our timer tick if work remains to be done.. + */ + for (;;) { + len = ttydisc_getc(tp, &ch, sizeof(ch)); + if (len == 0) + break; + GC_LOCK(); + gxemul_cons_write(ch); + GC_UNLOCK(); + } +} + +static void +gxemul_cons_timeout(void *v) +{ + struct tty *tp; + int c; + + tp = v; + tty_lock(tp); + GC_LOCK(); + while (gxemul_cons_readable()) { + c = gxemul_cons_read(); + GC_UNLOCK(); +#ifdef KDB + kdb_alt_break(c, &gxemul_cons_alt_break_state); +#endif + ttydisc_rint(tp, c, 0); + GC_LOCK(); + } + GC_UNLOCK(); + ttydisc_rint_done(tp); + tty_unlock(tp); + callout_reset(&gxemul_cons_callout, gxemul_cons_polltime, + gxemul_cons_timeout, tp); +} Added: head/sys/mips/conf/GXEMUL ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/mips/conf/GXEMUL Wed May 2 08:10:15 2012 (r234920) @@ -0,0 +1,52 @@ +# +# GXEMUL "oldtestmips" sample kernel configuration. +# +# $FreeBSD$ +# + +ident GXEMUL + +machine mips mips64eb +cpu CPU_MIPS4KC + +options HZ=100 + +makeoptions ARCH_FLAGS="-march=mips64 -mabi=64" + +makeoptions KERNLOADADDR=0xffffffff80100000 + +include "../gxemul/std.gxemul" + +hints "GXEMUL.hints" #Default places to look for devices. + +makeoptions DEBUG=-g #Build kernel with gdb(1) debug symbols + +makeoptions MODULES_OVERRIDE="" + +options DDB +options KDB + +options SCHED_ULE + +options FFS #Berkeley Fast Filesystem + +# Debugging for use in -current +#options DEADLKRES #Enable the deadlock resolver +options INVARIANTS #Enable calls of extra sanity checking +options INVARIANT_SUPPORT #Extra sanity checks of internal structures, required by INVARIANTS +#options WITNESS #Enable checks to detect deadlocks and cycles +#options WITNESS_SKIPSPIN #Don't run witness on spinlocks for speed + +# +# This kernel configuration uses an embedded 8MB memory root file system. +# Adjust the following path based on local requirements. +# +options MD_ROOT # MD is a potential root device +options MD_ROOT_SIZE=8192 +#makeoptions MFS_IMAGE=/local/scratch/rnw24/mdroot.img +options ROOTDEVNAME=\"ufs:md0\" + +device gxemul_cons +device md +device loop +device random Added: head/sys/mips/conf/GXEMUL.hints ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/mips/conf/GXEMUL.hints Wed May 2 08:10:15 2012 (r234920) @@ -0,0 +1 @@ +# $FreeBSD$ Added: head/sys/mips/gxemul/files.gxemul ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/mips/gxemul/files.gxemul Wed May 2 08:10:15 2012 (r234920) @@ -0,0 +1,5 @@ +# $FreeBSD$ +dev/gxemul/cons/gxemul_cons.c optional gxemul_cons +mips/gxemul/gxemul_machdep.c standard +mips/mips/intr_machdep.c standard +mips/mips/tick.c standard Added: head/sys/mips/gxemul/gxemul_machdep.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/mips/gxemul/gxemul_machdep.c Wed May 2 08:10:15 2012 (r234920) @@ -0,0 +1,191 @@ +/*- + * Copyright (c) 2006 Wojciech A. Koszek <wkoszek@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "opt_ddb.h" + +#include <sys/param.h> +#include <sys/conf.h> +#include <sys/kernel.h> +#include <sys/systm.h> +#include <sys/imgact.h> +#include <sys/bio.h> +#include <sys/buf.h> +#include <sys/bus.h> +#include <sys/cpu.h> +#include <sys/cons.h> +#include <sys/exec.h> +#include <sys/ucontext.h> +#include <sys/proc.h> +#include <sys/kdb.h> +#include <sys/ptrace.h> +#include <sys/reboot.h> +#include <sys/signalvar.h> +#include <sys/sysent.h> +#include <sys/sysproto.h> +#include <sys/user.h> + +#include <vm/vm.h> +#include <vm/vm_object.h> +#include <vm/vm_page.h> +#include <vm/vm_pager.h> + +#include <machine/clock.h> +#include <machine/cpu.h> +#include <machine/cpuregs.h> +#include <machine/hwfunc.h> +#include <machine/md_var.h> +#include <machine/pmap.h> +#include <machine/trap.h> + +extern int *edata; +extern int *end; + +void +platform_cpu_init() +{ + /* Nothing special */ +} + +static void +mips_init(void) +{ + int i; + + for (i = 0; i < 10; i++) { + phys_avail[i] = 0; + } + + /* phys_avail regions are in bytes */ + phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end); + phys_avail[1] = ctob(realmem); + + dump_avail[0] = phys_avail[0]; + dump_avail[1] = phys_avail[1]; + + physmem = realmem; + + init_param1(); + init_param2(physmem); + mips_cpu_init(); + pmap_bootstrap(); + mips_proc0_init(); + mutex_init(); + kdb_init(); +#ifdef KDB + if (boothowto & RB_KDB) + kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger"); +#endif +} + +void +platform_halt(void) +{ + +} + + +void +platform_identify(void) +{ + +} + +/* + * Perform a board-level soft-reset. + * + * XXXRW: Does gxemul have a moral equivalent to board-level reset? + */ +void +platform_reset(void) +{ + + panic("%s: not yet", __func__); +} + +void +platform_trap_enter(void) +{ + +} + +void +platform_trap_exit(void) +{ + +} + +void +platform_start(__register_t a0, __register_t a1, __register_t a2, + __register_t a3) +{ + vm_offset_t kernend; + uint64_t platform_counter_freq; + int argc = a0; + char **argv = (char **)a1; + char **envp = (char **)a2; + unsigned int memsize = a3; + int i; + + /* clear the BSS and SBSS segments */ + kernend = (vm_offset_t)&end; + memset(&edata, 0, kernend - (vm_offset_t)(&edata)); + + mips_postboot_fixup(); + + mips_pcpu0_init(); + + /* + * XXXRW: Support for the gxemul real-time clock required in order to + * usefully determine our emulated timer frequency. Go with something + * classic as the default in the mean time. + */ + platform_counter_freq = MIPS_DEFAULT_HZ; + mips_timer_early_init(platform_counter_freq); + + cninit(); + printf("entry: platform_start()\n"); + + bootverbose = 1; + if (bootverbose) { + printf("cmd line: "); + for (i = 0; i < argc; i++) + printf("%s ", argv[i]); + printf("\n"); + + printf("envp:\n"); + for (i = 0; envp[i]; i += 2) + printf("\t%s = %s\n", envp[i], envp[i+1]); + + printf("memsize = %08x\n", memsize); + } + + realmem = btoc(memsize); + mips_init(); + + mips_timer_init_params(platform_counter_freq, 0); +} Added: head/sys/mips/gxemul/std.gxemul ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/mips/gxemul/std.gxemul Wed May 2 08:10:15 2012 (r234920) @@ -0,0 +1,4 @@ +# $FreeBSD$ +files "../gxemul/files.gxemul" + +cpu CPU_MIPS4KC
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