[PATCH 2/2] Shared MMU initialization for ARM BSPs and RaspberryPi MMU support
Gedare Bloom
gedare at rtems.org
Thu Oct 3 12:56:35 UTC 2013
Thanks Alan.
Patch committed with the fix for the struct definition, and also I
reworded the commit message a little bit.
Please verify,
Gedare
On Wed, Oct 2, 2013 at 10:53 AM, Alan Cudmore <alan.cudmore at gmail.com> wrote:
> It looks good to me. I updated my RTEMS git and tools, then I compiled and
> ran it on the raspberry Pi.
>
> The only thing that did not work:
>
> In the file arm-cp15-start.h, I had to move
> typedef struct {
> uint32_t begin;
> uint32_t end;
> uint32_t flags;
> } arm_cp15_start_section_config;
>
> to be before
> extern const arm_cp15_start_section_config bsp_mm_config_table[];
>
> It did not compile if the bsp_mm_config_table declaration was first.
>
>
> Alan
>
>
> On 9/28/2013 12:07 PM, Gedare Bloom wrote:
>>
>> Looks good on my end. Alan or Sebastian have any comments?
>> -Gedare
>>
>> On Sat, Sep 28, 2013 at 4:08 AM, Hesham AL-Matary
>> <heshamelmatary at gmail.com> wrote:
>>>
>>> The newly added ORed flag: ARM_CP15_CTRL_XP is vital to get RaspberryPi
>>> MMU working properly and to share the container function between various
>>> ARM BSPs. The new ORed flags do not affect the current BSPs that make use
>>> of arm_cp15_start_setup_translation_table_and_enable_mmu_and_cache
>>> function.
>>>
>>> The rest is of the patch targets MMU initialization for ARM
>>> architectures,
>>> desgined to be shared. Later patches make use of shared mminit
>>> implementation.
>>>
>>> ---
>>> c/src/lib/libbsp/arm/raspberrypi/Makefile.am | 9 ++-
>>> c/src/lib/libbsp/arm/raspberrypi/preinstall.am | 8 +++
>>> .../libbsp/arm/raspberrypi/startup/bspstarthooks.c | 22 +------
>>> c/src/lib/libbsp/arm/raspberrypi/startup/linkcmds | 4 +-
>>> .../arm/raspberrypi/startup/mm_config_table.c | 70
>>> ++++++++++++++++++++++
>>> .../lib/libbsp/arm/shared/include/arm-cp15-start.h | 15 +++--
>>> c/src/lib/libbsp/arm/shared/mminit.c | 24 ++++++++
>>> c/src/lib/libbsp/shared/include/mm.h | 25 ++++++++
>>> 8 files changed, 151 insertions(+), 26 deletions(-)
>>> create mode 100644
>>> c/src/lib/libbsp/arm/raspberrypi/startup/mm_config_table.c
>>> create mode 100644 c/src/lib/libbsp/arm/shared/mminit.c
>>> create mode 100644 c/src/lib/libbsp/shared/include/mm.h
>>>
>>> diff --git a/c/src/lib/libbsp/arm/raspberrypi/Makefile.am
>>> b/c/src/lib/libbsp/arm/raspberrypi/Makefile.am
>>> index 24d396c..a06979a 100644
>>> --- a/c/src/lib/libbsp/arm/raspberrypi/Makefile.am
>>> +++ b/c/src/lib/libbsp/arm/raspberrypi/Makefile.am
>>> @@ -27,6 +27,7 @@ nodist_include_HEADERS = ../../shared/include/coverhd.h
>>> \
>>> nodist_include_bsp_HEADERS = ../../shared/include/bootcard.h
>>>
>>> include_bsp_HEADERS =
>>> +include_bsp_HEADERS += ../../../libbsp/shared/include/mm.h
>>> include_bsp_HEADERS += ../../shared/include/utility.h
>>> include_bsp_HEADERS += ../../shared/include/irq-generic.h
>>> include_bsp_HEADERS += ../../shared/include/irq-info.h
>>> @@ -35,6 +36,7 @@ include_bsp_HEADERS +=
>>> ../../shared/include/uart-output-char.h
>>> include_bsp_HEADERS += ../../shared/tod.h
>>> include_bsp_HEADERS += ../shared/include/linker-symbols.h
>>> include_bsp_HEADERS += ../shared/include/start.h
>>> +include_bsp_HEADERS += ../shared/include/arm-cp15-start.h
>>> include_bsp_HEADERS += ../shared/lpc/include/lpc-timer.h
>>> include_bsp_HEADERS += ../shared/lpc/include/lpc-dma.h
>>> include_bsp_HEADERS += include/irq.h
>>> @@ -83,7 +85,7 @@ libbsp_a_SOURCES += ../../shared/sbrk.c
>>> libbsp_a_SOURCES += ../../shared/src/stackalloc.c
>>> libbsp_a_SOURCES += ../shared/abort/simple_abort.c
>>> libbsp_a_SOURCES += ../shared/startup/bsp-start-memcpy.S
>>> -
>>> +libbsp_a_SOURCES += ../shared/arm-cp15-set-ttb-entries.c
>>>
>>> # Startup
>>> libbsp_a_SOURCES += startup/bspreset.c
>>> @@ -91,6 +93,7 @@ libbsp_a_SOURCES += startup/bspstart.c
>>>
>>> # IRQ
>>> libbsp_a_SOURCES += ../../shared/src/irq-default-handler.c
>>> +libbsp_a_SOURCES += ../shared/arm-cp15-set-exception-handler.c
>>> libbsp_a_SOURCES += ../../shared/src/irq-generic.c
>>> libbsp_a_SOURCES += ../../shared/src/irq-info.c
>>> libbsp_a_SOURCES += ../../shared/src/irq-legacy.c
>>> @@ -127,6 +130,10 @@ libbsp_a_CPPFLAGS +=
>>> -I$(srcdir)/../../../libcpu/arm/shared/include
>>> # Start hooks
>>> libbsp_a_SOURCES += startup/bspstarthooks.c
>>>
>>> +# LIBMM
>>> +libbsp_a_SOURCES += startup/mm_config_table.c
>>> +libbsp_a_SOURCES += ../shared/mminit.c
>>> +
>>>
>>> ###############################################################################
>>> # Network #
>>>
>>> ###############################################################################
>>> diff --git a/c/src/lib/libbsp/arm/raspberrypi/preinstall.am
>>> b/c/src/lib/libbsp/arm/raspberrypi/preinstall.am
>>> index 056c5f1..a638e64 100644
>>> --- a/c/src/lib/libbsp/arm/raspberrypi/preinstall.am
>>> +++ b/c/src/lib/libbsp/arm/raspberrypi/preinstall.am
>>> @@ -62,6 +62,10 @@ $(PROJECT_INCLUDE)/bsp/bootcard.h:
>>> ../../shared/include/bootcard.h $(PROJECT_INC
>>> $(INSTALL_DATA) $< $(PROJECT_INCLUDE)/bsp/bootcard.h
>>> PREINSTALL_FILES += $(PROJECT_INCLUDE)/bsp/bootcard.h
>>>
>>> +$(PROJECT_INCLUDE)/bsp/mm.h: ../../../libbsp/shared/include/mm.h
>>> $(PROJECT_INCLUDE)/bsp/$(dirstamp)
>>> + $(INSTALL_DATA) $< $(PROJECT_INCLUDE)/bsp/mm.h
>>> +PREINSTALL_FILES += $(PROJECT_INCLUDE)/bsp/mm.h
>>> +
>>> $(PROJECT_INCLUDE)/bsp/utility.h: ../../shared/include/utility.h
>>> $(PROJECT_INCLUDE)/bsp/$(dirstamp)
>>> $(INSTALL_DATA) $< $(PROJECT_INCLUDE)/bsp/utility.h
>>> PREINSTALL_FILES += $(PROJECT_INCLUDE)/bsp/utility.h
>>> @@ -94,6 +98,10 @@ $(PROJECT_INCLUDE)/bsp/start.h:
>>> ../shared/include/start.h $(PROJECT_INCLUDE)/bsp
>>> $(INSTALL_DATA) $< $(PROJECT_INCLUDE)/bsp/start.h
>>> PREINSTALL_FILES += $(PROJECT_INCLUDE)/bsp/start.h
>>>
>>> +$(PROJECT_INCLUDE)/bsp/arm-cp15-start.h:
>>> ../shared/include/arm-cp15-start.h $(PROJECT_INCLUDE)/bsp/$(dirstamp)
>>> + $(INSTALL_DATA) $< $(PROJECT_INCLUDE)/bsp/arm-cp15-start.h
>>> +PREINSTALL_FILES += $(PROJECT_INCLUDE)/bsp/arm-cp15-start.h
>>> +
>>> $(PROJECT_INCLUDE)/bsp/lpc-timer.h: ../shared/lpc/include/lpc-timer.h
>>> $(PROJECT_INCLUDE)/bsp/$(dirstamp)
>>> $(INSTALL_DATA) $< $(PROJECT_INCLUDE)/bsp/lpc-timer.h
>>> PREINSTALL_FILES += $(PROJECT_INCLUDE)/bsp/lpc-timer.h
>>> diff --git a/c/src/lib/libbsp/arm/raspberrypi/startup/bspstarthooks.c
>>> b/c/src/lib/libbsp/arm/raspberrypi/startup/bspstarthooks.c
>>> index a224168..71b2ff1 100644
>>> --- a/c/src/lib/libbsp/arm/raspberrypi/startup/bspstarthooks.c
>>> +++ b/c/src/lib/libbsp/arm/raspberrypi/startup/bspstarthooks.c
>>> @@ -7,6 +7,7 @@
>>> */
>>>
>>> /*
>>> + * Copyright (c) 2013. Hesham AL-Matary
>>> * Copyright (c) 2013 by Alan Cudmore
>>> * based on work by:
>>> * Copyright (c) 2009
>>> @@ -24,33 +25,16 @@
>>> #include <bspopts.h>
>>> #include <bsp/start.h>
>>> #include <bsp/raspberrypi.h>
>>> -#include <bsp/mmu.h>
>>> -
>>> -static void BSP_START_TEXT_SECTION raspberrypi_cache_setup(void)
>>> -{
>>> - uint32_t ctrl = 0;
>>> -
>>> - /* Disable MMU and cache, basic settings */
>>> - ctrl = arm_cp15_get_control();
>>> - ctrl &= ~(ARM_CP15_CTRL_I | ARM_CP15_CTRL_R | ARM_CP15_CTRL_C
>>> - | ARM_CP15_CTRL_V | ARM_CP15_CTRL_M);
>>> - ctrl |= ARM_CP15_CTRL_S;
>>> - arm_cp15_set_control(ctrl);
>>> -
>>> - arm_cp15_cache_invalidate();
>>> - arm_cp15_tlb_invalidate();
>>> -
>>> -}
>>> -
>>> +#include <bsp/mm.h>
>>>
>>> void BSP_START_TEXT_SECTION bsp_start_hook_0(void)
>>> {
>>> - raspberrypi_cache_setup();
>>> }
>>>
>>>
>>> void BSP_START_TEXT_SECTION bsp_start_hook_1(void)
>>> {
>>> bsp_start_copy_sections();
>>> + bsp_memory_management_initialize();
>>> bsp_start_clear_bss();
>>> }
>>> diff --git a/c/src/lib/libbsp/arm/raspberrypi/startup/linkcmds
>>> b/c/src/lib/libbsp/arm/raspberrypi/startup/linkcmds
>>> index b9a0dd8..c12b348 100644
>>> --- a/c/src/lib/libbsp/arm/raspberrypi/startup/linkcmds
>>> +++ b/c/src/lib/libbsp/arm/raspberrypi/startup/linkcmds
>>> @@ -35,7 +35,8 @@
>>>
>>> MEMORY {
>>> VECTOR_RAM (AIW) : ORIGIN = 0x0 , LENGTH = 0x8000
>>> - RAM (AIW) : ORIGIN = 0x00008000, LENGTH = 128M -
>>> 0x8000
>>> + RAM (AIW) : ORIGIN = 0x00008000, LENGTH = 128M - 48K
>>> + RAM_MMU (AIW) : ORIGIN = 128M - 16k, LENGTH = 16k
>>> }
>>>
>>> REGION_ALIAS ("REGION_START", RAM);
>>> @@ -58,5 +59,6 @@ bsp_stack_irq_size = DEFINED (bsp_stack_irq_size) ?
>>> bsp_stack_irq_size : 4096;
>>> bsp_stack_abt_size = DEFINED (bsp_stack_abt_size) ? bsp_stack_abt_size
>>> : 1024;
>>>
>>> bsp_section_robarrier_align = DEFINED (bsp_section_robarrier_align) ?
>>> bsp_section_robarrier_align : 1M;
>>> +bsp_translation_table_base = ORIGIN (RAM_MMU);
>>>
>>> INCLUDE linkcmds.armv4
>>> diff --git a/c/src/lib/libbsp/arm/raspberrypi/startup/mm_config_table.c
>>> b/c/src/lib/libbsp/arm/raspberrypi/startup/mm_config_table.c
>>> new file mode 100644
>>> index 0000000..fd85513
>>> --- /dev/null
>>> +++ b/c/src/lib/libbsp/arm/raspberrypi/startup/mm_config_table.c
>>> @@ -0,0 +1,70 @@
>>> +/*
>>> + * Copyright (c) 2013 embedded brains GmbH. All rights reserved.
>>> + *
>>> + * embedded brains GmbH
>>> + * Dornierstr. 4
>>> + * 82178 Puchheim
>>> + * Germany
>>> + * <info at embedded-brains.de>
>>> + *
>>> + * The license and distribution terms for this file may be
>>> + * found in the file LICENSE in this distribution or at
>>> + * http://www.rtems.com/license/LICENSE.
>>> + */
>>> +
>>> +#include <bsp/start.h>
>>> +#include <bsp/arm-cp15-start.h>
>>> +
>>> +#ifdef RTEMS_SMP
>>> + #define MMU_DATA_READ_WRITE ARMV7_MMU_DATA_READ_WRITE_SHAREABLE
>>> +#else
>>> + #define MMU_DATA_READ_WRITE ARMV7_MMU_DATA_READ_WRITE_CACHED
>>> +#endif
>>> +
>>> +BSP_START_DATA_SECTION const arm_cp15_start_section_config
>>> +bsp_mm_config_table[] = {
>>> + {
>>> + .begin = (uint32_t) bsp_section_fast_text_begin,
>>> + .end = (uint32_t) bsp_section_fast_text_end,
>>> + .flags = ARMV7_MMU_CODE_CACHED
>>> + }, {
>>> + .begin = (uint32_t) bsp_section_fast_data_begin,
>>> + .end = (uint32_t) bsp_section_fast_data_end,
>>> + .flags = MMU_DATA_READ_WRITE
>>> + }, {
>>> + .begin = (uint32_t) bsp_section_start_begin,
>>> + .end = (uint32_t) bsp_section_start_end,
>>> + .flags = ARMV7_MMU_CODE_CACHED
>>> + }, {
>>> + .begin = (uint32_t) bsp_section_vector_begin,
>>> + .end = (uint32_t) bsp_section_vector_end,
>>> + .flags = MMU_DATA_READ_WRITE
>>> + }, {
>>> + .begin = (uint32_t) bsp_section_text_begin,
>>> + .end = (uint32_t) bsp_section_text_end,
>>> + .flags = ARMV7_MMU_CODE_CACHED
>>> + }, {
>>> + .begin = (uint32_t) bsp_section_rodata_begin,
>>> + .end = (uint32_t) bsp_section_rodata_end,
>>> + .flags = ARMV7_MMU_DATA_READ_ONLY_CACHED
>>> + }, {
>>> + .begin = (uint32_t) bsp_section_data_begin,
>>> + .end = (uint32_t) bsp_section_data_end,
>>> + .flags = MMU_DATA_READ_WRITE
>>> + }, {
>>> + .begin = (uint32_t) bsp_section_bss_begin,
>>> + .end = (uint32_t) bsp_section_bss_end,
>>> + .flags = MMU_DATA_READ_WRITE
>>> + }, {
>>> + .begin = (uint32_t) bsp_section_work_begin,
>>> + .end = (uint32_t) bsp_section_work_end,
>>> + .flags = MMU_DATA_READ_WRITE
>>> + }, {
>>> + .begin = (uint32_t) bsp_section_stack_begin,
>>> + .end = (uint32_t) bsp_section_stack_end,
>>> + .flags = MMU_DATA_READ_WRITE
>>> + }
>>> +};
>>> +
>>> +BSP_START_DATA_SECTION const size_t bsp_mm_config_table_size =
>>> +RTEMS_ARRAY_SIZE(&bsp_mm_config_table);
>>> diff --git a/c/src/lib/libbsp/arm/shared/include/arm-cp15-start.h
>>> b/c/src/lib/libbsp/arm/shared/include/arm-cp15-start.h
>>> index 01f3104..6a2598b 100644
>>> --- a/c/src/lib/libbsp/arm/shared/include/arm-cp15-start.h
>>> +++ b/c/src/lib/libbsp/arm/shared/include/arm-cp15-start.h
>>> @@ -1,4 +1,5 @@
>>> -/*
>>> +/*
>>> + * Copyright (c) 2013 Hesham AL-Matary.
>>> * Copyright (c) 2009-2013 embedded brains GmbH. All rights reserved.
>>> *
>>> * embedded brains GmbH
>>> @@ -16,13 +17,15 @@
>>> #define LIBBSP_ARM_SHARED_ARM_CP15_START_H
>>>
>>> #include <libcpu/arm-cp15.h>
>>> -
>>> #include <bsp/start.h>
>>>
>>> #ifdef __cplusplus
>>> extern "C" {
>>> #endif /* __cplusplus */
>>>
>>> +extern const arm_cp15_start_section_config bsp_mm_config_table[];
>>> +extern const size_t bsp_mm_config_table_size;
>>> +
>>> BSP_START_TEXT_SECTION static inline void
>>> arm_cp15_set_domain_access_control(uint32_t val);
>>>
>>> @@ -87,9 +90,9 @@
>>> arm_cp15_start_setup_translation_table_and_enable_mmu_and_cache(
>>> arm_cp15_set_domain_access_control(dac);
>>> arm_cp15_set_translation_table_base(ttb);
>>>
>>> - /* Initialize translation table with invalid entries */
>>> + /* Initialize translation table with fixed-map read-write entries */
>>> for (i = 0; i < ARM_MMU_TRANSLATION_TABLE_ENTRY_COUNT; ++i) {
>>> - ttb [i] = 0;
>>> + ttb [i] = (i << ARM_MMU_SECT_BASE_SHIFT) |
>>> ARMV7_MMU_DATA_READ_WRITE;
>>> }
>>>
>>> for (i = 0; i < config_count; ++i) {
>>> @@ -97,7 +100,9 @@
>>> arm_cp15_start_setup_translation_table_and_enable_mmu_and_cache(
>>> }
>>>
>>> /* Enable MMU and cache */
>>> - ctrl |= ARM_CP15_CTRL_I | ARM_CP15_CTRL_C | ARM_CP15_CTRL_M;
>>> + ctrl |= ARM_CP15_CTRL_AFE | ARM_CP15_CTRL_S | ARM_CP15_CTRL_I |
>>> + ARM_CP15_CTRL_C | ARM_CP15_CTRL_M | ARM_CP15_CTRL_XP;
>>> +
>>> arm_cp15_set_control(ctrl);
>>> }
>>>
>>> diff --git a/c/src/lib/libbsp/arm/shared/mminit.c
>>> b/c/src/lib/libbsp/arm/shared/mminit.c
>>> new file mode 100644
>>> index 0000000..0ea9805
>>> --- /dev/null
>>> +++ b/c/src/lib/libbsp/arm/shared/mminit.c
>>> @@ -0,0 +1,24 @@
>>> +/*
>>> + * Copyright (c) 2013 Hesham AL-Matary.
>>> + *
>>> + * The license and distribution terms for this file may be
>>> + * found in the file LICENSE in this distribution or at
>>> + * http://www.rtems.com/license/LICENSE.
>>> + */
>>> +#include <bsp/arm-cp15-start.h>
>>> +#include <bsp/linker-symbols.h>
>>> +#include <bsp/mm.h>
>>> +#include <bsp/start.h>
>>> +
>>> +BSP_START_TEXT_SECTION void bsp_memory_management_initialize(void)
>>> +{
>>> + uint32_t ctrl = arm_cp15_get_control();
>>> +
>>> + arm_cp15_start_setup_translation_table_and_enable_mmu_and_cache(
>>> + ctrl,
>>> + (uint32_t *) bsp_translation_table_base,
>>> + ARM_MMU_DEFAULT_CLIENT_DOMAIN,
>>> + &bsp_mm_config_table[0],
>>> + bsp_mm_config_table_size
>>> + );
>>> +}
>>> diff --git a/c/src/lib/libbsp/shared/include/mm.h
>>> b/c/src/lib/libbsp/shared/include/mm.h
>>> new file mode 100644
>>> index 0000000..1a1eb7f
>>> --- /dev/null
>>> +++ b/c/src/lib/libbsp/shared/include/mm.h
>>> @@ -0,0 +1,25 @@
>>> +/*
>>> + * Copyright (c) 2013 Hesham AL-Matary.
>>> + * Copyright (c) 2013 Gedare Bloom.
>>> + *
>>> + * The license and distribution terms for this file may be
>>> + * found in the file LICENSE in this distribution or at
>>> + * http://www.rtems.com/license/LICENSE.
>>> + */
>>> +
>>> +#ifndef __LIBBSP_MM_H
>>> +#define __LIBBSP_MM_H
>>> +
>>> +#include <stdint.h>
>>> +#include <stdlib.h>
>>> +
>>> +#ifdef __cplusplus
>>> +extern "C" {
>>> +#endif
>>> +
>>> +void bsp_memory_management_initialize(void);
>>> +
>>> +#ifdef __cplusplus
>>> +}
>>> +#endif
>>> +#endif
>>> --
>>> 1.8.3.1
>>>
>>> _______________________________________________
>>> rtems-devel mailing list
>>> rtems-devel at rtems.org
>>> http://www.rtems.org/mailman/listinfo/rtems-devel
>
>
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