X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=arch%2Fsparc%2Fcpu%2Fleon3%2Fstart.S;h=1988ee1f6b6bf3566588f95ea040ad31fdbc0d67;hb=574be25ea1b88ff1b7d213584b04b754f187e25d;hp=bd634bd0c2de4109f5854b119e19350d936213fc;hpb=1e9c26578ebbeecbaf3d8fb574957405eff17c86;p=oweals%2Fu-boot.git diff --git a/arch/sparc/cpu/leon3/start.S b/arch/sparc/cpu/leon3/start.S index bd634bd0c2..1988ee1f6b 100644 --- a/arch/sparc/cpu/leon3/start.S +++ b/arch/sparc/cpu/leon3/start.S @@ -1,34 +1,29 @@ /* This is where the SPARC/LEON3 starts - * Copyright (C) 2007, - * Daniel Hellstrom, daniel@gaisler.com * - * See file CREDITS for list of people who contributed to this - * project. + * Copyright (C) 2007, 2015 + * Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of - * the License, or (at your option) any later version. - * - * 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., 59 Temple Place, Suite 330, Boston, - * MA 02111-1307 USA + * SPDX-License-Identifier: GPL-2.0+ */ +#include #include #include #include #include #include #include -#include -#include +#include + +/* Default Plug&Play I/O area */ +#ifndef CONFIG_AMBAPP_IOAREA +#define CONFIG_AMBAPP_IOAREA AMBA_DEFAULT_IOAREA +#endif + +/* Default number of SPARC register windows */ +#ifndef CONFIG_SYS_SPARC_NWINDOWS +#define CONFIG_SYS_SPARC_NWINDOWS 8 +#endif /* Entry for traps which jump to a programmer-specified trap handler. */ #define TRAPR(H) \ @@ -73,6 +68,27 @@ MINFRAME = (WINDOWSIZE + ARGPUSHSIZE + 4) #error Must define number of SPARC register windows, default is 8 #endif +/* Macros to load address into a register. Uses GOT table for PIC */ +#ifdef __PIC__ + +#define SPARC_PIC_THUNK_CALL(reg) \ + sethi %pc22(_GLOBAL_OFFSET_TABLE_-4), %##reg; \ + call __sparc_get_pc_thunk.reg; \ + add %##reg, %pc10(_GLOBAL_OFFSET_TABLE_+4), %##reg; + +#define SPARC_LOAD_ADDRESS(sym, got, reg) \ + sethi %gdop_hix22(sym), %##reg; \ + xor %##reg, %gdop_lox10(sym), %##reg; \ + ld [%##got + %##reg], %##reg, %gdop(sym); + +#else + +#define SPARC_PIC_THUNK_CALL(reg) +#define SPARC_LOAD_ADDRESS(sym, got, tmp) \ + set sym, %##reg; + +#endif + #define STACK_ALIGN 8 #define SA(X) (((X)+(STACK_ALIGN-1)) & ~(STACK_ALIGN-1)) @@ -192,19 +208,9 @@ _trap_table: SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! f4-f7 SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! f8-fb SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; SOFT_TRAP; ! fc-ff -/* - * Version string - */ - - .data - .extern leon3_snooping_avail - .globl version_string -version_string: - .ascii U_BOOT_VERSION - .ascii " (", U_BOOT_DATE, " - ", U_BOOT_TIME, ")" - .ascii CONFIG_IDENT_STRING, "\0" .section ".text" + .extern _nomem_amba_init, _nomem_memory_ctrl_init .align 4 _hardreset: @@ -247,7 +253,7 @@ clear_window: bge clear_window save -wininit: +wiminit: set WIM_INIT, %g3 mov %g3, %wim @@ -256,9 +262,41 @@ stackp: andn %fp, 0x0f, %fp sub %fp, 64, %sp +/* Obtain the address of _GLOBAL_OFFSET_TABLE_ */ + SPARC_PIC_THUNK_CALL(l7) + +/* Scan AMBA Bus for AMBA buses using PnP information. All found + * AMBA buses I/O area will be located in i0-i5 upon return. + * The i0-i5 registers are later used by _nomem_amba_init2 + */ +ambainit: + call _nomem_amba_init + sethi %hi(CONFIG_AMBAPP_IOAREA), %o0 + +/* Scan AMBA Buses for memory controllers, then initialize the + * memory controllers. Note that before setting up the memory controller + * the stack can not be used. + */ +memory_ctrl_init: + SPARC_LOAD_ADDRESS(grlib_mctrl_handlers, l7, o0) + + call _nomem_memory_ctrl_init + nop + +/* The return valu indicate how many memory controllers where found and + * initialized, if no memory controller was initialized, we can not continue + * because from here on we expect memory to be working. + */ + cmp %o0, 0 +memory_ctrl_init_failed: + beq memory_ctrl_init_failed + nop + +/*** From now on the stack can be used. ***/ + cpu_init_unreloc: call cpu_init_f - nop + nop /* un relocated start address of monitor */ #define TEXT_START _text @@ -267,8 +305,8 @@ cpu_init_unreloc: #define DATA_END __init_end reloc: - set TEXT_START,%g2 - set DATA_END,%g3 + SPARC_LOAD_ADDRESS(TEXT_START, l7, g2) + SPARC_LOAD_ADDRESS(DATA_END, l7, g3) set CONFIG_SYS_RELOC_MONITOR_BASE,%g4 reloc_loop: ldd [%g2],%l0 @@ -278,7 +316,7 @@ reloc_loop: inc 16,%g2 subcc %g3,%g2,%g0 bne reloc_loop - inc 16,%g4 + inc 16,%g4 clr %l0 clr %l1 @@ -295,8 +333,8 @@ reloc_loop: clr_bss: /* clear bss area (the relocated) */ - set __bss_start,%g2 - set __bss_end,%g3 + SPARC_LOAD_ADDRESS(__bss_start, l7, g2) + SPARC_LOAD_ADDRESS(__bss_end, l7, g3) sub %g3,%g2,%g3 add %g3,%g4,%g3 clr %g1 /* std %g0 uses g0 and g1 */ @@ -307,19 +345,19 @@ clr_bss_16: inc 16,%g4 cmp %g3,%g4 bne clr_bss_16 - nop + nop /* add offsets to GOT table */ fixup_got: - set __got_start,%g4 - set __got_end,%g3 + SPARC_LOAD_ADDRESS(__got_start, l7, g4) + SPARC_LOAD_ADDRESS(__got_end, l7, g3) /* * new got offset = (old GOT-PTR (read with ld) - * CONFIG_SYS_RELOC_MONITOR_BASE(from define) ) + * Destination Address (from define) */ set CONFIG_SYS_RELOC_MONITOR_BASE,%g2 - set TEXT_START, %g1 + SPARC_LOAD_ADDRESS(TEXT_START, l7, g1) add %g4,%g2,%g4 sub %g4,%g1,%g4 add %g3,%g2,%g3 @@ -334,11 +372,11 @@ got_loop: inc 4,%g4 cmp %g3,%g4 bne got_loop - nop + nop prom_relocate: - set __prom_start, %g2 - set __prom_end, %g3 + SPARC_LOAD_ADDRESS(__prom_start, l7, g2) + SPARC_LOAD_ADDRESS(__prom_end, l7, g3) set CONFIG_SYS_PROM_OFFSET, %g4 prom_relocate_loop: @@ -349,7 +387,7 @@ prom_relocate_loop: inc 16,%g2 subcc %g3,%g2,%g0 bne prom_relocate_loop - inc 16,%g4 + inc 16,%g4 /* Trap table has been moved, lets tell CPU about * the new trap table address @@ -361,34 +399,22 @@ prom_relocate_loop: nop nop -/* If CACHE snooping is available in hardware the - * variable leon3_snooping_avail will be set to - * 0x800000 else 0. - */ -snoop_detect: - sethi %hi(0x00800000), %o0 - lda [%g0] 2, %o1 - and %o0, %o1, %o0 - sethi %hi(leon3_snooping_avail+CONFIG_SYS_RELOC_MONITOR_BASE-TEXT_BASE), %o1 - st %o0, [%lo(leon3_snooping_avail+CONFIG_SYS_RELOC_MONITOR_BASE-TEXT_BASE)+%o1] - -/* call relocate*/ - nop /* Call relocated init functions */ jump: - set cpu_init_f2,%o1 + SPARC_LOAD_ADDRESS(cpu_init_f2, l7, o1) set CONFIG_SYS_RELOC_MONITOR_BASE,%o2 add %o1,%o2,%o1 sub %o1,%g1,%o1 call %o1 - clr %o0 + clr %o0 - set board_init_f,%o1 + SPARC_LOAD_ADDRESS(board_init_f, l7, o1) set CONFIG_SYS_RELOC_MONITOR_BASE,%o2 + SPARC_LOAD_ADDRESS(TEXT_START, l7, g1) add %o1,%o2,%o1 sub %o1,%g1,%o1 call %o1 - clr %o0 + clr %o0 dead: ta 0 ! if call returns... nop @@ -410,7 +436,7 @@ _irq_entry: WRITE_PAUSE mov %l7, %o0 ! irq level set handler_irq, %o1 - set (CONFIG_SYS_RELOC_MONITOR_BASE-TEXT_BASE), %o2 + set (CONFIG_SYS_RELOC_MONITOR_BASE-CONFIG_SYS_TEXT_BASE), %o2 add %o1, %o2, %o1 call %o1 add %sp, SF_REGS_SZ, %o1 ! pt_regs ptr