Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * IBM/3270 Driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Author(s):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *   Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *   Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *     Copyright IBM Corp. 2003, 2009
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <asm/idals.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <asm/ioctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) /* ioctls for fullscreen 3270 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #define TUBICMD		_IO('3', 3)	/* set ccw command for fs reads. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #define TUBOCMD		_IO('3', 4)	/* set ccw command for fs writes. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #define TUBGETI		_IO('3', 7)	/* get ccw command for fs reads. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #define TUBGETO		_IO('3', 8)	/* get ccw command for fs writes. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #define TUBSETMOD	_IO('3',12)	/* FIXME: what does it do ?*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #define TUBGETMOD	_IO('3',13)	/* FIXME: what does it do ?*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) /* Local Channel Commands */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define TC_WRITE	0x01		/* Write */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #define TC_RDBUF	0x02		/* Read Buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #define TC_EWRITE	0x05		/* Erase write */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #define TC_READMOD	0x06		/* Read modified */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #define TC_EWRITEA	0x0d		/* Erase write alternate */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define TC_WRITESF	0x11		/* Write structured field */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) /* Buffer Control Orders */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define TO_SF		0x1d		/* Start field */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #define TO_SBA		0x11		/* Set buffer address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #define TO_IC		0x13		/* Insert cursor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #define TO_PT		0x05		/* Program tab */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #define TO_RA		0x3c		/* Repeat to address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #define TO_SFE		0x29		/* Start field extended */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #define TO_EUA		0x12		/* Erase unprotected to address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #define TO_MF		0x2c		/* Modify field */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #define TO_SA		0x28		/* Set attribute */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) /* Field Attribute Bytes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) #define TF_INPUT	0x40		/* Visible input */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) #define TF_INPUTN	0x4c		/* Invisible input */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) #define TF_INMDT	0xc1		/* Visible, Set-MDT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) #define TF_LOG		0x60
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) /* Character Attribute Bytes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) #define TAT_RESET	0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) #define TAT_FIELD	0xc0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) #define TAT_EXTHI	0x41
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) #define TAT_COLOR	0x42
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) #define TAT_CHARS	0x43
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) #define TAT_TRANS	0x46
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) /* Extended-Highlighting Bytes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) #define TAX_RESET	0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) #define TAX_BLINK	0xf1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) #define TAX_REVER	0xf2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) #define TAX_UNDER	0xf4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) /* Reset value */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) #define TAR_RESET	0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) /* Color values */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) #define TAC_RESET	0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) #define TAC_BLUE	0xf1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) #define TAC_RED		0xf2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) #define TAC_PINK	0xf3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) #define TAC_GREEN	0xf4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) #define TAC_TURQ	0xf5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) #define TAC_YELLOW	0xf6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) #define TAC_WHITE	0xf7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) #define TAC_DEFAULT	0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) /* Write Control Characters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) #define TW_NONE		0x40		/* No particular action */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) #define TW_KR		0xc2		/* Keyboard restore */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) #define TW_PLUSALARM	0x04		/* Add this bit for alarm */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) #define RAW3270_FIRSTMINOR	1	/* First minor number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) #define RAW3270_MAXDEVS		255	/* Max number of 3270 devices */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) /* For TUBGETMOD and TUBSETMOD. Should include. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) struct raw3270_iocb {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	short model;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	short line_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	short col_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	short pf_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	short re_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	short map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) struct raw3270;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) struct raw3270_view;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) extern struct class *class3270;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) /* 3270 CCW request */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) struct raw3270_request {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	struct list_head list;		/* list head for request queueing. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	struct raw3270_view *view;	/* view of this request */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	struct ccw1 ccw;		/* single ccw. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	void *buffer;			/* output buffer. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	size_t size;			/* size of output buffer. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	int rescnt;			/* residual count from devstat. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	int rc;				/* return code for this request. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	/* Callback for delivering final status. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	void (*callback)(struct raw3270_request *, void *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	void *callback_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct raw3270_request *raw3270_request_alloc(size_t size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) void raw3270_request_free(struct raw3270_request *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) void raw3270_request_reset(struct raw3270_request *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) void raw3270_request_set_cmd(struct raw3270_request *, u8 cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) int  raw3270_request_add_data(struct raw3270_request *, void *, size_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) void raw3270_request_set_data(struct raw3270_request *, void *, size_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) void raw3270_request_set_idal(struct raw3270_request *, struct idal_buffer *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) raw3270_request_final(struct raw3270_request *rq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	return list_empty(&rq->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) void raw3270_buffer_address(struct raw3270 *, char *, unsigned short);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)  * Functions of a 3270 view.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) struct raw3270_fn {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	int  (*activate)(struct raw3270_view *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	void (*deactivate)(struct raw3270_view *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	void (*intv)(struct raw3270_view *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		     struct raw3270_request *, struct irb *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	void (*release)(struct raw3270_view *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	void (*free)(struct raw3270_view *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	void (*resize)(struct raw3270_view *, int, int, int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)  * View structure chaining. The raw3270_view structure is meant to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)  * be embedded at the start of the real view data structure, e.g.:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)  *   struct example {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)  *     struct raw3270_view view;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)  *     ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)  *   };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) struct raw3270_view {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) #define RAW3270_VIEW_LOCK_IRQ	0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) #define RAW3270_VIEW_LOCK_BH	1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	atomic_t ref_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	struct raw3270 *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	struct raw3270_fn *fn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	unsigned int model;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	unsigned int rows, cols;	/* # of rows & colums of the view */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	unsigned char *ascebc;		/* ascii -> ebcdic table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) int raw3270_add_view(struct raw3270_view *, struct raw3270_fn *, int, int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) int raw3270_activate_view(struct raw3270_view *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) void raw3270_del_view(struct raw3270_view *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) void raw3270_deactivate_view(struct raw3270_view *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) struct raw3270_view *raw3270_find_view(struct raw3270_fn *, int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) int raw3270_start(struct raw3270_view *, struct raw3270_request *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) int raw3270_start_locked(struct raw3270_view *, struct raw3270_request *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) int raw3270_start_irq(struct raw3270_view *, struct raw3270_request *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) int raw3270_reset(struct raw3270_view *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) struct raw3270_view *raw3270_view(struct raw3270_view *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) int raw3270_view_active(struct raw3270_view *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) /* Reference count inliner for view structures. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) raw3270_get_view(struct raw3270_view *view)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	atomic_inc(&view->ref_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) extern wait_queue_head_t raw3270_wait_queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) raw3270_put_view(struct raw3270_view *view)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	if (atomic_dec_return(&view->ref_count) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		wake_up(&raw3270_wait_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) struct raw3270 *raw3270_setup_console(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) void raw3270_wait_cons_dev(struct raw3270 *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) /* Notifier for device addition/removal */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) struct raw3270_notifier {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	void (*create)(int minor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	void (*destroy)(int minor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) int raw3270_register_notifier(struct raw3270_notifier *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) void raw3270_unregister_notifier(struct raw3270_notifier *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) void raw3270_pm_unfreeze(struct raw3270_view *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)  * Little memory allocator for string objects. 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) struct string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	struct list_head update;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	unsigned long size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	unsigned long len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	char string[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) } __attribute__ ((aligned(8)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) static inline struct string *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) alloc_string(struct list_head *free_list, unsigned long len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	struct string *cs, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	unsigned long size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	size = (len + 7L) & -8L;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	list_for_each_entry(cs, free_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		if (cs->size < size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		if (cs->size > size + sizeof(struct string)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 			char *endaddr = (char *) (cs + 1) + cs->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 			tmp = (struct string *) (endaddr - size) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 			tmp->size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 			cs->size -= size + sizeof(struct string);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 			cs = tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 			list_del(&cs->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		cs->len = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		INIT_LIST_HEAD(&cs->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		INIT_LIST_HEAD(&cs->update);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		return cs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) static inline unsigned long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) free_string(struct list_head *free_list, struct string *cs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	struct string *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	struct list_head *p, *left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	/* Find out the left neighbour in free memory list. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	left = free_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	list_for_each(p, free_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		if (list_entry(p, struct string, list) > cs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		left = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	/* Try to merge with right neighbour = next element from left. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	if (left->next != free_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		tmp = list_entry(left->next, struct string, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		if ((char *) (cs + 1) + cs->size == (char *) tmp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 			list_del(&tmp->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 			cs->size += tmp->size + sizeof(struct string);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	/* Try to merge with left neighbour. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	if (left != free_list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		tmp = list_entry(left, struct string, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		if ((char *) (tmp + 1) + tmp->size == (char *) cs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 			tmp->size += cs->size + sizeof(struct string);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 			return tmp->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	__list_add(&cs->list, left, left->next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	return cs->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) add_string_memory(struct list_head *free_list, void *mem, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	struct string *cs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	cs = (struct string *) mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	cs->size = size - sizeof(struct string);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	free_string(free_list, cs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)