1 /* This file is subject to the terms and conditions of the GNU General Public
2 * License. See the file "COPYING" in the main directory of this archive
5 * Copyright (C) 1999-2007 by Helge Deller <deller@gmx.de>
6 * Copyright 1999 SuSE GmbH (Philipp Rumpf)
7 * Copyright 1999 Philipp Rumpf (prumpf@tux.org)
8 * Copyright 2000 Hewlett Packard (Paul Bame, bame@puffin.external.hp.com)
9 * Copyright (C) 2001 Grant Grundler (Hewlett Packard)
10 * Copyright (C) 2004 Kyle McMartin <kyle@debian.org>
12 * Initial Version 04-23-1999 by Helge Deller <deller@gmx.de>
15 #include <asm/asm-offsets.h>
19 #include <asm/assembly.h>
21 #include <linux/linkage.h>
22 #include <linux/init.h>
23 #include <linux/pgtable.h>
38 .import init_task,data
39 .import init_stack,data
40 .import fault_vector_20,code /* IVA parisc 2.0 32 bit */
42 .import fault_vector_11,code /* IVA parisc 1.1 32 bit */
43 .import $global$ /* forward declaration */
44 #endif /*!CONFIG_64BIT*/
45 ENTRY(parisc_kernel_start)
49 /* Make sure sr4-sr7 are set to zero for the kernel address space */
55 /* Clear BSS (shouldn't the boot loader do this?) */
57 .import __bss_start,data
58 .import __bss_stop,data
60 load32 PA(__bss_start),%r3
61 load32 PA(__bss_stop),%r4
63 cmpb,<<,n %r3,%r4,$bss_loop
66 /* Save away the arguments the boot loader passed in (32 bit args) */
67 load32 PA(boot_args),%r1
73 /* Initialize startup VM. Just map first 16/32 MB of memory */
74 load32 PA(swapper_pg_dir),%r4
75 mtctl %r4,%cr24 /* Initialize kernel root pointer */
76 mtctl %r4,%cr25 /* Initialize user root pointer */
78 #if CONFIG_PGTABLE_LEVELS == 3
81 shrd %r5,PxD_VALUE_SHIFT,%r3
82 ldo (PxD_FLAG_PRESENT+PxD_FLAG_VALID)(%r3),%r3
83 stw %r3,ASM_PGD_ENTRY*ASM_PGD_ENTRY_SIZE(%r4)
84 ldo ASM_PMD_ENTRY*ASM_PMD_ENTRY_SIZE(%r5),%r4
86 /* 2-level page table, so pmd == pgd */
87 ldo ASM_PGD_ENTRY*ASM_PGD_ENTRY_SIZE(%r4),%r4
90 /* Fill in pmd with enough pte directories */
92 SHRREG %r1,PxD_VALUE_SHIFT,%r3
93 ldo (PxD_FLAG_PRESENT+PxD_FLAG_VALID)(%r3),%r3
95 ldi ASM_PT_INITIAL,%r1
99 ldo (PAGE_SIZE >> PxD_VALUE_SHIFT)(%r3),%r3
101 #if CONFIG_PGTABLE_LEVELS == 3
102 ldo ASM_PMD_ENTRY_SIZE(%r4),%r4
104 ldo ASM_PGD_ENTRY_SIZE(%r4),%r4
108 /* Now initialize the PTEs themselves. We use RWX for
109 * everything ... it will get remapped correctly later */
110 ldo 0+_PAGE_KERNEL_RWX(%r0),%r3 /* Hardwired 0 phys addr start */
111 load32 (1<<(KERNEL_INITIAL_ORDER-PAGE_SHIFT)),%r11 /* PFN count */
115 STREGM %r3,ASM_PTE_ENTRY_SIZE(%r1)
116 ldo (1<<PFN_PTE_SHIFT)(%r3),%r3 /* add one PFN */
117 addib,> -1,%r11,$pgt_fill_loop
120 /* Load the return address...er...crash 'n burn */
123 /* And the RFI Target address too */
124 load32 start_parisc,%r11
126 /* And the initial task pointer */
130 /* And the stack pointer too */
131 load32 init_stack,%sp
133 #if defined(CONFIG_64BIT) && defined(CONFIG_FUNCTION_TRACER)
135 /* initialize mcount FPTR */
136 /* Get the global data pointer */
138 load32 PA(_mcount), %r10
143 /* Get PDCE_PROC for monarch CPU. */
144 #define MEM_PDC_LO 0x388
145 #define MEM_PDC_HI 0x35C
146 ldw MEM_PDC_LO(%r0),%r3
147 ldw MEM_PDC_HI(%r0),%r10
148 depd %r10, 31, 32, %r3 /* move to upper word */
153 /* Set the smp rendezvous address into page zero.
154 ** It would be safer to do this in init_smp_config() but
155 ** it's just way easier to deal with here because
156 ** of 64-bit function ptrs and the address is local to this file.
158 load32 PA(smp_slave_stext),%r10
159 stw %r10,0x10(%r0) /* MEM_RENDEZ */
160 stw %r0,0x28(%r0) /* MEM_RENDEZ_HI - assume addr < 4GB */
165 #ifdef CONFIG_HOTPLUG_CPU
166 /* common_stext is far away in another section... jump there */
167 load32 PA(common_stext), %rp
170 /* common_stext and smp_slave_stext needs to be in text section */
175 ** Code Common to both Monarch and Slave processors.
179 ** %r11 must contain RFI target address.
180 ** %r25/%r26 args to pass to target function
181 ** %r2 in case rfi target decides it didn't like something
184 ** %r3 PDCE_PROC address
185 ** %r11 RFI target address
187 ** Caller must init: SR4-7, %sp, %r10, %cr24/25,
193 /* Clear PDC entry point - we won't use it */
194 stw %r0,0x10(%r0) /* MEM_RENDEZ */
195 stw %r0,0x28(%r0) /* MEM_RENDEZ_HI */
196 #endif /*CONFIG_SMP*/
199 mfctl %cr30,%r6 /* PCX-W2 firmware bug */
202 /* Save the rfi target address */
203 STREG %r11, TASK_PT_GR11(%r6)
204 /* Switch to wide mode Superdome doesn't support narrow PDC
207 1: mfia %rp /* clear upper part of pcoq */
213 /* Set Wide mode as the "Default" (eg for traps)
214 ** First trap occurs *right* after (or part of) rfi for slave CPUs.
215 ** Someday, palo might not do this for the Monarch either.
219 ldo PDC_PSW(%r0),%arg0 /* 21 */
220 ldo PDC_PSW_SET_DEFAULTS(%r0),%arg1 /* 2 */
221 ldo PDC_PSW_WIDE_BIT(%r0),%arg2 /* 2 */
222 load32 PA(stext_pdc_ret), %rp
227 LDREG TASK_PT_GR11(%r6), %r11
229 mtctl %r6,%cr30 /* restore task thread info */
232 /* PARANOID: clear user scratch/user space SR's */
238 /* Initialize Protection Registers */
244 /* Initialize the global data pointer */
247 /* Set up our interrupt table. HPMCs might not work after this!
249 * We need to install the correct iva for PA1.1 or PA2.0. The
250 * following short sequence of instructions can determine this
251 * (without being illegal on a PA1.1 machine).
259 comib,<>,n 0,%r10,$is_pa20
260 ldil L%PA(fault_vector_11),%r10
262 ldo R%PA(fault_vector_11)(%r10),%r10
265 .level PA_ASM_LEVEL /* restore 1.1 || 2.0w */
266 #endif /*!CONFIG_64BIT*/
267 load32 PA(fault_vector_20),%r10
272 b aligned_rfi /* Prepare to RFI! Man all the cannons! */
279 copy %r3, %arg0 /* PDCE_PROC for smp_callin() */
281 rsm PSW_SM_QUIET,%r0 /* off troublesome PSW bits */
282 /* Don't need NOPs, have 8 compliant insn before rfi */
284 mtctl %r0,%cr17 /* Clear IIASQ tail */
285 mtctl %r0,%cr17 /* Clear IIASQ head */
287 /* Load RFI target into PC queue */
288 mtctl %r11,%cr18 /* IIAOQ head */
290 mtctl %r11,%cr18 /* IIAOQ tail */
292 load32 KERNEL_PSW,%r10
297 /* Jump through hyperspace to Virt Mode */
305 .import smp_init_current_idle_task,data
306 .import smp_callin,code
312 break 1,1 /* Break if returned from start_secondary */
316 #endif /*!CONFIG_64BIT*/
318 /***************************************************************************
319 * smp_slave_stext is executed by all non-monarch Processors when the Monarch
320 * pokes the slave CPUs in smp.c:smp_boot_cpus().
322 * Once here, registers values are initialized in order to branch to virtual
323 * mode. Once all available/eligible CPUs are in virtual mode, all are
324 * released and start out by executing their own idle task.
325 *****************************************************************************/
331 ** Initialize Space registers
340 * Enable Wide mode early, in case the task_struct for the idle
341 * task in smp_init_current_idle_task was allocated above 4GB.
343 1: mfia %rp /* clear upper part of pcoq */
351 /* Initialize the SP - monarch sets up smp_init_current_idle_task */
352 load32 PA(smp_init_current_idle_task),%r6
356 LDREG TASK_STACK(%r6),%sp
358 ldo FRAME_SIZE(%sp),%sp
360 /* point CPU to kernel page tables */
361 load32 PA(swapper_pg_dir),%r4
362 mtctl %r4,%cr24 /* Initialize kernel root pointer */
363 mtctl %r4,%cr25 /* Initialize user root pointer */
366 /* Setup PDCE_PROC entry */
369 /* Load RFI *return* address in case smp_callin bails */
370 load32 smp_callin_rtn,%r2
373 /* Load RFI target address. */
374 load32 smp_callin,%r11
376 /* ok...common code can handle the rest */
381 #endif /* CONFIG_SMP */
384 .section .data..ro_after_init
387 .export $global$,data
389 .type $global$,@object
393 #endif /*!CONFIG_64BIT*/