82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
typedef struct asr_prop_area asr_prop_area;
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typedef struct asr_prop_info asr_prop_info;
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#define ASR_PROP_AREA_MAGIC 0x504f5250 //"PROP"
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#define ASR_PROP_AREA_VERSION 0x00000003
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#define ASR_PROP_AREA_BASE 0xB0020C00
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#define ASR_PROP_AREA_TOTAL_SIZE 0x00001000
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//asr_prop_info_size = PROP_NAME_MAX + PROP_VALUE_MAX + sizeof(asr_prop_info.serial)
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//ASR_PA_COUNT_MAX = (ASR_PA_SIZE - ASR_PA_INFO_START)/asr_prop_info_size
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//ASR_PA_INFO_START >= (ASR_PA_COUNT_MAX*4) + sizeof[asr_prop_area(magic+count+serial+version+reserved[4])]
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#define PROP_NAME_MAX 20
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#define PROP_VALUE_MAX 40
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#define ASR_PA_INFO_START 256
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//for preboot & boot2
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//the limitation of PROPERTY_ASRE size should be 1k
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//[0xB0020C00]~[0xB0021000] 1K PROPERTY
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//after boot2 but before CP
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//the limitation of PROPERTY_ASRE size should be 4k
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//[0xB0020C00]~[0xB0021C00] 4K PROPERTY
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#ifdef TINY_PROP_AREA
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#define ASR_PA_COUNT_MAX 12
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#define ASR_PA_SIZE 1024
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#else
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#define ASR_PA_COUNT_MAX 60
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#define ASR_PA_SIZE (ASR_PROP_AREA_TOTAL_SIZE)
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#endif
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#define TOC_NAME_LEN(toc) ((toc) >> 24)
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#define TOC_TO_INFO(area, toc) ((asr_prop_info*) (((char*) area) + ((toc) & 0xFFFFFF)))
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struct asr_prop_area {
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unsigned magic;
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unsigned volatile count;
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unsigned volatile serial;
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unsigned version;
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unsigned reserved[4];
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//a pointer here
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unsigned toc[1];
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};
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#define SERIAL_VALUE_LEN(serial) ((serial) >> 24)
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#define SERIAL_DIRTY(serial) ((serial) & 1)
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/*
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** Rules:
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**
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** - there is only one writer, but many readers
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** - asr_prop_area.count will never decrease in value
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** - once allocated, a prop_info's name will not change
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** - once allocated, a prop_info's offset will not change
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** - reading a value requires the following steps
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** 1. serial = pi->serial
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** 2. if SERIAL_DIRTY(serial), wait*, then goto 1
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** 3. memcpy(local, pi->value, SERIAL_VALUE_LEN(serial) + 1)
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** 4. if pi->serial != serial, goto 2
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**
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** - writing a value requires the following steps
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** 1. pi->serial = pi->serial | 1
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** 2. memcpy(pi->value, local_value, value_len)
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** 3. pi->serial = (value_len << 24) | ((pi->serial + 1) & 0xffffff)
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**
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*/
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struct asr_prop_info {
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char name[PROP_NAME_MAX];
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unsigned volatile serial;
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char value[PROP_VALUE_MAX];
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};
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//COMMON_API
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int asr_property_area_init(int force_init);
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int asr_property_dump(void);
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int asr_property_set(const char *name, const char *value);
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const char* asr_property_get(const char *name);
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int asr_property_get_buffer(const char *name, char *buffer);
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int asr_property_set_param(const char *name, const char *value, unsigned len);
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