2013-05-24 23:35:29 +00:00
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/*
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* Raspberry Pi support library for the ACK
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* © 2013 David Given
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* This file is redistributable under the terms of the 3-clause BSD license.
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* See the file 'Copying' in the root of the distribution for the full text.
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*/
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#ifndef PI_H
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#define PI_H
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2013-05-26 18:41:37 +00:00
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/* When running in kernel mode, this structure gets the incoming parameters.
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* In bare metal mode, it's gibberish. */
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struct pi_kernel_parameters
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{
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int r5;
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int r4;
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void* r3;
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void* r2;
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void* r1;
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void* r0;
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};
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extern struct pi_kernel_parameters* pi_kernel_parameters;
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2013-05-24 23:35:29 +00:00
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/* Initialise the mini UART (only do this if running on bare metal! */
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2013-05-25 23:22:39 +00:00
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extern void pi_init_uart(void);
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2013-05-24 23:35:29 +00:00
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/* Converts a pointer from a physical address to a user address. */
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2013-05-25 23:22:39 +00:00
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extern void* pi_phys_to_user(void* ptr);
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2013-05-24 23:35:29 +00:00
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/* Converts a pointer from a user address to a physical address. */
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2013-05-25 23:22:39 +00:00
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extern void* pi_user_to_phys(void* ptr);
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2013-05-24 23:35:29 +00:00
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2013-06-24 22:57:27 +00:00
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/* Change the clock speed from 19.2MHz to 250MHz. Must be called *before*
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* pi_init_uart(). */
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extern void pi_fast_mode(void);
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/* Initialise the RAM. */
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extern void pi_init_ram(void);
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/* The current clock speed (used by pi_init_uart to calculate the correct
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* UART settings). */
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extern int pi_clock_speed;
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2013-05-24 23:35:29 +00:00
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#endif
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