]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commitdiff
Hexagon: Add startup code
authorRichard Kuo <rkuo@codeaurora.org>
Mon, 31 Oct 2011 23:42:28 +0000 (18:42 -0500)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 1 Nov 2011 14:34:19 +0000 (07:34 -0700)
Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/hexagon/kernel/head.S [new file with mode: 0644]
arch/hexagon/kernel/reset.c [new file with mode: 0644]
arch/hexagon/kernel/setup.c [new file with mode: 0644]

diff --git a/arch/hexagon/kernel/head.S b/arch/hexagon/kernel/head.S
new file mode 100644 (file)
index 0000000..8e6b819
--- /dev/null
@@ -0,0 +1,162 @@
+/*
+ * Early kernel startup code for Hexagon
+ *
+ * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/asm-offsets.h>
+#include <asm/mem-layout.h>
+#include <asm/vm_mmu.h>
+#include <asm/page.h>
+
+       __INIT
+ENTRY(stext)
+       /*
+        * VMM will already have set up true vector page, MMU, etc.
+        * To set up initial kernel identity map, we have to pass
+        * the VMM a pointer to some canonical page tables. In
+        * this implementation, we're assuming that we've got
+        * them precompiled. Generate value in R24, as we'll need
+        * it again shortly.
+        */
+       r24.L = #LO(swapper_pg_dir)
+       r24.H = #HI(swapper_pg_dir)
+
+       /*
+        * Symbol is kernel segment address, but we need
+        * the logical/physical address.
+        */
+       r24 = asl(r24, #2)
+       r24 = lsr(r24, #2)
+
+       r0 = r24
+
+       /*
+        * Initialize a 16MB PTE to make the virtual and physical
+        * addresses where the kernel was loaded be identical.
+        */
+#define PTE_BITS ( __HVM_PTE_R | __HVM_PTE_W | __HVM_PTE_X     \
+                 | __HEXAGON_C_WB_L2 << 6                      \
+                 | __HVM_PDE_S_4MB)
+
+       r1 = pc
+       r2.H = #0xffc0
+       r2.L = #0x0000
+       r1 = and(r1,r2)         /* round PC to 4MB boundary     */
+       r2 = lsr(r1, #22)       /* 4MB page number              */
+       r2 = asl(r2, #2)        /* times sizeof(PTE) (4bytes)   */
+       r0 = add(r0,r2)         /* r0 = address of correct PTE  */
+       r2 = #PTE_BITS
+       r1 = add(r1,r2)         /* r1 = 4MB PTE for the first entry     */
+       r2.h = #0x0040
+       r2.l = #0x0000          /* 4MB  */
+       memw(r0 ++ #4) = r1
+       r1 = add(r1, r2)
+       memw(r0 ++ #4) = r1
+
+       r0 = r24
+
+       /*
+        * The subroutine wrapper around the virtual instruction touches
+        * no memory, so we should be able to use it even here.
+        */
+       call    __vmnewmap;
+
+       /*  Jump into virtual address range.  */
+
+       r31.h = #hi(__head_s_vaddr_target)
+       r31.l = #lo(__head_s_vaddr_target)
+       jumpr r31
+
+       /*  Insert trippy space effects.  */
+
+__head_s_vaddr_target:
+       /*
+        * Tear down VA=PA translation now that we are running
+        * in the desgnated kernel segments.
+        */
+       r0 = #__HVM_PDE_S_INVALID
+       r1 = r24
+       loop0(1f,#0x100)
+1:
+       {
+               memw(R1 ++ #4) = R0
+       }:endloop0
+
+       r0 = r24
+       call __vmnewmap
+
+       /*  Go ahead and install the trap0 return so angel calls work  */
+       r0.h = #hi(_K_provisional_vec)
+       r0.l = #lo(_K_provisional_vec)
+       call __vmsetvec
+
+       /*
+        * OK, at this point we should start to be much more careful,
+        * we're going to enter C code and start touching memory
+        * in all sorts of places.
+        * This means:
+        *      SGP needs to be OK
+        *      Need to lock shared resources
+        *      A bunch of other things that will cause
+        *      all kinds of painful bugs
+        */
+
+       /*
+        * Stack pointer should be pointed at the init task's
+        * thread stack, which should have been declared in arch/init_task.c.
+        * So uhhhhh...
+        * It's accessible via the init_thread_union, which is a union
+        * of a thread_info struct and a stack; of course, the top
+        * of the stack is not for you.  The end of the stack
+        * is simply init_thread_union + THREAD_SIZE.
+        */
+
+       {r29.H = #HI(init_thread_union); r0.H = #HI(_THREAD_SIZE); }
+       {r29.L = #LO(init_thread_union); r0.L = #LO(_THREAD_SIZE); }
+
+       /*  initialize the register used to point to current_thread_info */
+       /*  Fixme:  THREADINFO_REG can't be R2 because of that memset thing. */
+       {r29 = add(r29,r0); THREADINFO_REG = r29; }
+
+       /*  Hack:  zero bss; */
+       { r0.L = #LO(__bss_start);  r1 = #0; r2.l = #LO(__bss_stop); }
+       { r0.H = #HI(__bss_start);           r2.h = #HI(__bss_stop); }
+
+       r2 = sub(r2,r0);
+       call memset;
+
+       /* Time to make the doughnuts.   */
+       call start_kernel
+
+       /*
+        * Should not reach here.
+        */
+1:
+       jump 1b
+
+.p2align PAGE_SHIFT
+ENTRY(external_cmdline_buffer)
+        .fill _PAGE_SIZE,1,0
+
+.data
+.p2align PAGE_SHIFT
+ENTRY(empty_zero_page)
+        .fill _PAGE_SIZE,1,0
diff --git a/arch/hexagon/kernel/reset.c b/arch/hexagon/kernel/reset.c
new file mode 100644 (file)
index 0000000..4d72fc5
--- /dev/null
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include <linux/smp.h>
+#include <asm/hexagon_vm.h>
+
+void machine_power_off(void)
+{
+       smp_send_stop();
+       __vmstop();
+}
+
+void machine_halt(void)
+{
+}
+
+void machine_restart(char *cmd)
+{
+}
+
+void pm_power_off(void)
+{
+}
diff --git a/arch/hexagon/kernel/setup.c b/arch/hexagon/kernel/setup.c
new file mode 100644 (file)
index 0000000..1202f78
--- /dev/null
@@ -0,0 +1,145 @@
+/*
+ * Arch related setup for Hexagon
+ *
+ * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/mmzone.h>
+#include <linux/mm.h>
+#include <linux/seq_file.h>
+#include <linux/console.h>
+#include <linux/of_fdt.h>
+#include <asm/io.h>
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <asm/processor.h>
+#include <asm/hexagon_vm.h>
+#include <asm/vm_mmu.h>
+#include <asm/time.h>
+#ifdef CONFIG_OF
+#include <asm/prom.h>
+#endif
+
+char cmd_line[COMMAND_LINE_SIZE];
+static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
+
+int on_simulator;
+
+void __cpuinit calibrate_delay(void)
+{
+       loops_per_jiffy = thread_freq_mhz * 1000000 / HZ;
+}
+
+/*
+ * setup_arch -  high level architectural setup routine
+ * @cmdline_p: pointer to pointer to command-line arguments
+ */
+
+void __init setup_arch(char **cmdline_p)
+{
+       char *p = &external_cmdline_buffer;
+
+       /*
+        * These will eventually be pulled in via either some hypervisor
+        * or devicetree description.  Hardwiring for now.
+        */
+       pcycle_freq_mhz = 600;
+       thread_freq_mhz = 100;
+       sleep_clk_freq = 32000;
+
+       /*
+        * Set up event bindings to handle exceptions and interrupts.
+        */
+       __vmsetvec(_K_VM_event_vector);
+
+       /*
+        * Simulator has a few differences from the hardware.
+        * For now, check uninitialized-but-mapped memory
+        * prior to invoking setup_arch_memory().
+        */
+       if (*(int *)((unsigned long)_end + 8) == 0x1f1f1f1f)
+               on_simulator = 1;
+       else
+               on_simulator = 0;
+
+       if (p[0] != '\0')
+               strlcpy(boot_command_line, p, COMMAND_LINE_SIZE);
+       else
+               strlcpy(boot_command_line, default_command_line,
+                       COMMAND_LINE_SIZE);
+
+       /*
+        * boot_command_line and the value set up by setup_arch
+        * are both picked up by the init code. If no reason to
+        * make them different, pass the same pointer back.
+        */
+       strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
+       *cmdline_p = cmd_line;
+
+       parse_early_param();
+
+       setup_arch_memory();
+
+#ifdef CONFIG_SMP
+       smp_start_cpus();
+#endif
+}
+
+/*
+ * Functions for dumping CPU info via /proc
+ * Probably should move to kernel/proc.c or something.
+ */
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+       return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+       ++*pos;
+       return c_start(m, pos);
+}
+
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+
+/*
+ * Eventually this will dump information about
+ * CPU properties like ISA level, TLB size, etc.
+ */
+static int show_cpuinfo(struct seq_file *m, void *v)
+{
+       int cpu = (unsigned long) v - 1;
+
+       seq_printf(m, "processor\t: %d\n", cpu);
+       seq_printf(m, "model name\t: Hexagon Virtual Machine\n");
+       seq_printf(m, "BogoMips\t: %lu.%02lu\n",
+               (loops_per_jiffy * HZ) / 500000,
+               ((loops_per_jiffy * HZ) / 5000) % 100);
+       seq_printf(m, "\n");
+       return 0;
+}
+
+const struct seq_operations cpuinfo_op = {
+       .start  = &c_start,
+       .next   = &c_next,
+       .stop   = &c_stop,
+       .show   = &show_cpuinfo,
+};