#include "common.h"
#include "cmos_lowlevel.h"
-typedef struct
- { unsigned byte_index;
- unsigned bit_offset;
- }
-cmos_bit_op_location_t;
-
-static unsigned cmos_bit_op_strategy (unsigned bit, unsigned bits_left,
- cmos_bit_op_location_t *where);
-static unsigned char cmos_read_bits (const cmos_bit_op_location_t *where,
- unsigned nr_bits);
-static void cmos_write_bits (const cmos_bit_op_location_t *where,
- unsigned nr_bits, unsigned char value);
-static unsigned char get_bits (unsigned long long value, unsigned bit,
- unsigned nr_bits);
-static void put_bits (unsigned char value, unsigned bit, unsigned nr_bits,
- unsigned long long *result);
+/* Hardware Abstraction Layer: lowlevel byte-wise write access */
+
+extern cmos_access_t cmos_hal, memory_hal;
+static cmos_access_t *current_access = &cmos_hal;
+
+void select_hal(hal_t hal, void *data)
+{
+ switch(hal) {
+ case HAL_CMOS:
+ current_access = &cmos_hal;
+ break;
+ case HAL_MEMORY:
+ current_access = &memory_hal;
+ break;
+ }
+ current_access->init(data);
+}
+
+/* Bit-level access */
+typedef struct {
+ unsigned byte_index;
+ unsigned bit_offset;
+} cmos_bit_op_location_t;
+
+static unsigned cmos_bit_op_strategy(unsigned bit, unsigned bits_left,
+ cmos_bit_op_location_t * where);
+static unsigned char cmos_read_bits(const cmos_bit_op_location_t * where,
+ unsigned nr_bits);
+static void cmos_write_bits(const cmos_bit_op_location_t * where,
+ unsigned nr_bits, unsigned char value);
+static unsigned char get_bits(unsigned long long value, unsigned bit,
+ unsigned nr_bits);
+static void put_bits(unsigned char value, unsigned bit, unsigned nr_bits,
+ unsigned long long *result);
/****************************************************************************
* get_bits
* Extract a value 'nr_bits' bits wide starting at bit position 'bit' from
* 'value' and return the result. It is assumed that 'nr_bits' is at most 8.
****************************************************************************/
-static inline unsigned char get_bits (unsigned long long value, unsigned bit,
- unsigned nr_bits)
- { return (value >> bit) & ((unsigned char) ((1 << nr_bits) - 1)); }
+static inline unsigned char get_bits(unsigned long long value, unsigned bit,
+ unsigned nr_bits)
+{
+ return (value >> bit) & ((unsigned char)((1 << nr_bits) - 1));
+}
/****************************************************************************
* put_bits
* positions in 'result' where the result is stored are assumed to be
* initially zero.
****************************************************************************/
-static inline void put_bits (unsigned char value, unsigned bit,
- unsigned nr_bits, unsigned long long *result)
- { *result += ((unsigned long long)(value & ((unsigned char) ((1 << nr_bits) - 1)))) << bit; }
+static inline void put_bits(unsigned char value, unsigned bit,
+ unsigned nr_bits, unsigned long long *result)
+{
+ *result += ((unsigned long long)(value &
+ ((unsigned char)((1 << nr_bits) - 1)))) << bit;
+}
/****************************************************************************
* cmos_read
* and return this value. The I/O privilege level of the currently executing
* process must be set appropriately.
****************************************************************************/
-unsigned long long cmos_read (const cmos_entry_t *e)
- { cmos_bit_op_location_t where;
- unsigned bit = e->bit, length=e->length;
- unsigned next_bit, bits_left, nr_bits;
- unsigned long long result = 0;
- unsigned char value;
-
- assert(!verify_cmos_op(bit, length, e->config));
- result = 0;
-
- if (e->config == CMOS_ENTRY_STRING)
- { char *newstring = malloc((length+7)/8);
- unsigned usize = (8 * sizeof(unsigned long long));
-
- if(!newstring) { out_of_memory(); }
-
- for (next_bit = 0, bits_left = length;
- bits_left;
- next_bit += nr_bits, bits_left -= nr_bits)
- { nr_bits = cmos_bit_op_strategy(bit + next_bit, bits_left>usize?usize:bits_left, &where);
- value = cmos_read_bits(&where, nr_bits);
- put_bits(value, next_bit % usize, nr_bits, &((unsigned long long *)newstring)[next_bit/usize]);
- result = (unsigned long)newstring;
- }
- }
- else
- { for (next_bit = 0, bits_left = length;
- bits_left;
- next_bit += nr_bits, bits_left -= nr_bits)
- { nr_bits = cmos_bit_op_strategy(bit + next_bit, bits_left, &where);
- value = cmos_read_bits(&where, nr_bits);
- put_bits(value, next_bit, nr_bits, &result);
- }
- }
-
- return result;
- }
+unsigned long long cmos_read(const cmos_entry_t * e)
+{
+ cmos_bit_op_location_t where;
+ unsigned bit = e->bit, length = e->length;
+ unsigned next_bit, bits_left, nr_bits;
+ unsigned long long result = 0;
+ unsigned char value;
+
+ assert(!verify_cmos_op(bit, length, e->config));
+ result = 0;
+
+ if (e->config == CMOS_ENTRY_STRING) {
+ char *newstring = calloc(1, (length + 7) / 8);
+ unsigned usize = (8 * sizeof(unsigned long long));
+
+ if (!newstring) {
+ out_of_memory();
+ }
+
+ for (next_bit = 0, bits_left = length;
+ bits_left; next_bit += nr_bits, bits_left -= nr_bits) {
+ nr_bits = cmos_bit_op_strategy(bit + next_bit,
+ bits_left > usize ? usize : bits_left, &where);
+ value = cmos_read_bits(&where, nr_bits);
+ put_bits(value, next_bit % usize, nr_bits,
+ &((unsigned long long *)newstring)[next_bit /
+ usize]);
+ result = (unsigned long)newstring;
+ }
+ } else {
+ for (next_bit = 0, bits_left = length;
+ bits_left; next_bit += nr_bits, bits_left -= nr_bits) {
+ nr_bits =
+ cmos_bit_op_strategy(bit + next_bit, bits_left,
+ &where);
+ value = cmos_read_bits(&where, nr_bits);
+ put_bits(value, next_bit, nr_bits, &result);
+ }
+ }
+
+ return result;
+}
/****************************************************************************
* cmos_write
* The I/O privilege level of the currently executing process must be set
* appropriately.
****************************************************************************/
-void cmos_write (const cmos_entry_t *e, unsigned long long value)
- { cmos_bit_op_location_t where;
- unsigned bit = e->bit, length=e->length;
- unsigned next_bit, bits_left, nr_bits;
-
- assert(!verify_cmos_op(bit, length, e->config));
-
- if (e->config == CMOS_ENTRY_STRING)
- { unsigned long long *data = (unsigned long long *)(unsigned long)value;
- unsigned usize = (8 * sizeof(unsigned long long));
-
- for (next_bit = 0, bits_left = length;
- bits_left;
- next_bit += nr_bits, bits_left -= nr_bits)
- { nr_bits = cmos_bit_op_strategy(bit + next_bit, bits_left>usize?usize:bits_left, &where);
- value = data[next_bit/usize];
- cmos_write_bits(&where, nr_bits, get_bits(value, next_bit % usize, nr_bits));
- }
- }
- else
- { for (next_bit = 0, bits_left = length;
- bits_left;
- next_bit += nr_bits, bits_left -= nr_bits)
- { nr_bits = cmos_bit_op_strategy(bit + next_bit, bits_left, &where);
- cmos_write_bits(&where, nr_bits, get_bits(value, next_bit, nr_bits));
- }
- }
- }
+void cmos_write(const cmos_entry_t * e, unsigned long long value)
+{
+ cmos_bit_op_location_t where;
+ unsigned bit = e->bit, length = e->length;
+ unsigned next_bit, bits_left, nr_bits;
+
+ assert(!verify_cmos_op(bit, length, e->config));
+
+ if (e->config == CMOS_ENTRY_STRING) {
+ unsigned long long *data =
+ (unsigned long long *)(unsigned long)value;
+ unsigned usize = (8 * sizeof(unsigned long long));
+
+ for (next_bit = 0, bits_left = length;
+ bits_left; next_bit += nr_bits, bits_left -= nr_bits) {
+ nr_bits = cmos_bit_op_strategy(bit + next_bit,
+ bits_left > usize ? usize : bits_left,
+ &where);
+ value = data[next_bit / usize];
+ cmos_write_bits(&where, nr_bits,
+ get_bits(value, next_bit % usize, nr_bits));
+ }
+ } else {
+ for (next_bit = 0, bits_left = length;
+ bits_left; next_bit += nr_bits, bits_left -= nr_bits) {
+ nr_bits = cmos_bit_op_strategy(bit + next_bit,
+ bits_left, &where);
+ cmos_write_bits(&where, nr_bits,
+ get_bits(value, next_bit, nr_bits));
+ }
+ }
+}
/****************************************************************************
* cmos_read_byte
* Note: the first 14 bytes of nonvolatile RAM provide an interface to the
* real time clock.
****************************************************************************/
-unsigned char cmos_read_byte (unsigned index)
- { unsigned short port_0, port_1;
-
- assert(!verify_cmos_byte_index(index));
-
- if (index < 128)
- { port_0 = 0x70;
- port_1 = 0x71;
- }
- else
- { port_0 = 0x72;
- port_1 = 0x73;
- }
-
- OUTB(index, port_0);
- return INB(port_1);
- }
+unsigned char cmos_read_byte(unsigned index)
+{
+ return current_access->read(index);
+}
/****************************************************************************
* cmos_write_byte
* real time clock. Writing to any of these bytes will therefore
* affect its functioning.
****************************************************************************/
-void cmos_write_byte (unsigned index, unsigned char value)
- { unsigned short port_0, port_1;
-
- assert(!verify_cmos_byte_index(index));
-
- if (index < 128)
- { port_0 = 0x70;
- port_1 = 0x71;
- }
- else
- { port_0 = 0x72;
- port_1 = 0x73;
- }
-
- OUTB(index, port_0);
- OUTB(value, port_1);
- }
+void cmos_write_byte(unsigned index, unsigned char value)
+{
+ current_access->write(index, value);
+}
/****************************************************************************
* cmos_read_all
* Read all contents of CMOS memory into array 'data'. The first 14 bytes of
* 'data' are set to zero since this corresponds to the real time clock area.
****************************************************************************/
-void cmos_read_all (unsigned char data[])
- { unsigned i;
+void cmos_read_all(unsigned char data[])
+{
+ unsigned i;
- for (i = 0; i < CMOS_RTC_AREA_SIZE; i++)
- data[i] = 0;
+ for (i = 0; i < CMOS_RTC_AREA_SIZE; i++)
+ data[i] = 0;
- for (; i < CMOS_SIZE; i++)
- data[i] = cmos_read_byte(i);
- }
+ for (; i < CMOS_SIZE; i++)
+ data[i] = cmos_read_byte(i);
+}
/****************************************************************************
* cmos_write_all
* bytes of 'data' are ignored since this corresponds to the real time clock
* area.
****************************************************************************/
-void cmos_write_all (unsigned char data[])
- { unsigned i;
+void cmos_write_all(unsigned char data[])
+{
+ unsigned i;
- for (i = CMOS_RTC_AREA_SIZE; i < CMOS_SIZE; i++)
- cmos_write_byte(i, data[i]);
- }
+ for (i = CMOS_RTC_AREA_SIZE; i < CMOS_SIZE; i++)
+ cmos_write_byte(i, data[i]);
+}
/****************************************************************************
* set_iopl
* interrupts while executing in user space. Messing with the I/O privilege
* level is therefore somewhat dangerous.
****************************************************************************/
-void set_iopl (int level)
- {
-#if defined(__FreeBSD__)
- static int io_fd = -1;
-#endif
-
- assert((level >= 0) && (level <= 3));
-
-#if defined(__FreeBSD__)
- if (level == 0)
- {
- if (io_fd != -1)
- {
- close(io_fd);
- io_fd = -1;
- }
- }
- else
- {
- if (io_fd == -1)
- {
- io_fd = open("/dev/io", O_RDWR);
- if (io_fd < 0)
- {
- perror("/dev/io");
- exit(1);
- }
- }
- }
-#else
- if (iopl(level))
- { fprintf(stderr,
- "%s: iopl() system call failed. You must be root to do "
- "this.\n",
- prog_name);
- exit(1);
- }
-#endif
- }
+void set_iopl(int level)
+{
+ current_access->set_iopl(level);
+}
/****************************************************************************
* verify_cmos_op
* wish to read or write. Perform sanity checking on 'bit' and 'length'. If
* no problems were encountered, return OK. Else return an error code.
****************************************************************************/
-int verify_cmos_op (unsigned bit, unsigned length, cmos_entry_config_t config)
- { if ((bit >= (8 * CMOS_SIZE)) || ((bit + length) > (8 * CMOS_SIZE)))
- return CMOS_AREA_OUT_OF_RANGE;
+int verify_cmos_op(unsigned bit, unsigned length, cmos_entry_config_t config)
+{
+ if ((bit >= (8 * CMOS_SIZE)) || ((bit + length) > (8 * CMOS_SIZE)))
+ return CMOS_AREA_OUT_OF_RANGE;
- if (bit < (8 * CMOS_RTC_AREA_SIZE))
- return CMOS_AREA_OVERLAPS_RTC;
+ if (bit < (8 * CMOS_RTC_AREA_SIZE))
+ return CMOS_AREA_OVERLAPS_RTC;
- if (config == CMOS_ENTRY_STRING)
- return OK;
+ if (config == CMOS_ENTRY_STRING)
+ return OK;
- if (length > (8 * sizeof(unsigned long long)))
- return CMOS_AREA_TOO_WIDE;
+ if (length > (8 * sizeof(unsigned long long)))
+ return CMOS_AREA_TOO_WIDE;
- return OK;
- }
+ return OK;
+}
/****************************************************************************
* cmos_bit_op_strategy
* Helper function used by cmos_read() and cmos_write() to determine which
* bits to read or write next.
****************************************************************************/
-static unsigned cmos_bit_op_strategy (unsigned bit, unsigned bits_left,
- cmos_bit_op_location_t *where)
- { unsigned max_bits;
+static unsigned cmos_bit_op_strategy(unsigned bit, unsigned bits_left,
+ cmos_bit_op_location_t * where)
+{
+ unsigned max_bits;
- where->byte_index = bit >> 3;
- where->bit_offset = bit & 0x07;
- max_bits = 8 - where->bit_offset;
- return (bits_left > max_bits) ? max_bits : bits_left;
- }
+ where->byte_index = bit >> 3;
+ where->bit_offset = bit & 0x07;
+ max_bits = 8 - where->bit_offset;
+ return (bits_left > max_bits) ? max_bits : bits_left;
+}
/****************************************************************************
* cmos_read_bits
* Read a chunk of bits from a byte location within CMOS memory. Return the
* value represented by the chunk of bits.
****************************************************************************/
-static unsigned char cmos_read_bits (const cmos_bit_op_location_t *where,
- unsigned nr_bits)
- { return (cmos_read_byte(where->byte_index) >> where->bit_offset) &
- ((unsigned char) ((1 << nr_bits) - 1));
- }
+static unsigned char cmos_read_bits(const cmos_bit_op_location_t * where,
+ unsigned nr_bits)
+{
+ return (cmos_read_byte(where->byte_index) >> where->bit_offset) &
+ ((unsigned char)((1 << nr_bits) - 1));
+}
/****************************************************************************
* cmos_write_bits
* Write a chunk of bits (the low order 'nr_bits' bits of 'value') to an area
* within a particular byte of CMOS memory.
****************************************************************************/
-static void cmos_write_bits (const cmos_bit_op_location_t *where,
- unsigned nr_bits, unsigned char value)
- { unsigned char n, mask;
-
- if (nr_bits == 8)
- { cmos_write_byte(where->byte_index, value);
- return;
- }
-
- n = cmos_read_byte(where->byte_index);
- mask = ((unsigned char) ((1 << nr_bits) - 1)) << where->bit_offset;
- n = (n & ~mask) + ((value << where->bit_offset) & mask);
- cmos_write_byte(where->byte_index, n);
- }
+static void cmos_write_bits(const cmos_bit_op_location_t * where,
+ unsigned nr_bits, unsigned char value)
+{
+ unsigned char n, mask;
+
+ if (nr_bits == 8) {
+ cmos_write_byte(where->byte_index, value);
+ return;
+ }
+
+ n = cmos_read_byte(where->byte_index);
+ mask = ((unsigned char)((1 << nr_bits) - 1)) << where->bit_offset;
+ n = (n & ~mask) + ((value << where->bit_offset) & mask);
+ cmos_write_byte(where->byte_index, n);
+}
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