import xen 32 bit paravirtual kernel from /n/sources/xen.

1 files changed, 160 insertions, 0 deletions

diff --git a/sys/src/9/xen/mem.h b/sys/src/9/xen/mem.h
new file mode 100644
index 000000000..d0b3cc356
--- /dev/null
+++ b/sys/src/9/xen/mem.h
@@ -0,0 +1,160 @@
+/*
+ * Memory and machine-specific definitions.  Used in C and assembler.
+ */
+
+#define MIN(a, b)	((a) < (b)? (a): (b))
+#define MAX(a, b)	((a) > (b)? (a): (b))
+
+/*
+ * Sizes
+ */
+#define	BI2BY		8			/* bits per byte */
+#define	BI2WD		32			/* bits per word */
+#define	BY2WD		4			/* bytes per word */
+#define	BY2V		8			/* bytes per double word */
+#define	BY2PG		4096			/* bytes per page */
+#define	WD2PG		(BY2PG/BY2WD)		/* words per page */
+#define	PGSHIFT		12			/* log(BY2PG) */
+#define	ROUND(s, sz)	(((s)+((sz)-1))&~((sz)-1))
+#define	PGROUND(s)	ROUND(s, BY2PG)
+#define	BLOCKALIGN	8
+#define FPalign		16			/* required for FXSAVE */
+
+#define	MAXMACH		8			/* max # cpus system can run */
+#define	MAX_VIRT_CPUS	MAXMACH
+#define	KSTACK		4096			/* Size of kernel stack */
+
+/*
+ * Time
+ */
+#define	HZ		(100)			/* clock frequency */
+#define	MS2HZ		(1000/HZ)		/* millisec per clock tick */
+#define	TK2SEC(t)	((t)/HZ)		/* ticks to seconds */
+
+/*
+ * Fundamental addresses
+ */
+#define	REBOOTADDR	0x00001000		/* reboot code - physical address */
+#define	APBOOTSTRAP	0x80001000		/* AP bootstrap code */
+#define	MACHADDR	0x80002000		/* as seen by current processor */
+#define	CPU0MACH	MACHADDR		/* Mach for bootstrap processor */
+#define	XENCONSOLE	0x80003000		/* xen console ring */
+#define	XENSHARED	0x80004000		/* xen shared page */
+#define	XENBUS		0x80005000		/* xenbus aka xenstore ring */
+#define	XENGRANTTAB	0x80006000		/* grant table */
+
+#define	MACHSIZE	BY2PG
+
+/*
+ *  Address spaces
+ *
+ *  User is at 0-2GB
+ *  Kernel is at 2GB-4GB
+ */
+#define	UZERO		0			/* base of user address space */
+#define	UTZERO		(UZERO+BY2PG)		/* first address in user text */
+#define UTROUND(t)	ROUNDUP((t), BY2PG)
+#define	KZERO		0x80000000		/* base of kernel address space */
+#define	KTZERO		0x80010000		/* first address in kernel text */
+#define	USTKTOP		(KZERO-BY2PG)		/* byte just beyond user stack */
+#define	USTKSIZE	(16*1024*1024)		/* size of user stack */
+#define	TSTKTOP		(USTKTOP-USTKSIZE)	/* end of new stack in sysexec */
+#define	TSTKSIZ 	100
+
+/*
+ *  known x86 segments (in GDT) and their selectors
+ */
+#define	NULLSEG	0	/* null segment */
+#define	KDSEG	1	/* kernel data/stack */
+#define	KESEG	2	/* kernel executable */	
+#define	UDSEG	3	/* user data/stack */
+#define	UESEG	4	/* user executable */
+#define	TSSSEG	5	/* task segment */
+#define	APMCSEG		6	/* APM code segment */
+#define	APMCSEG16	7	/* APM 16-bit code segment */
+#define	APMDSEG		8	/* APM data segment */
+#define	PROCSEG0	11	/* per process descriptor0 */
+#define	NPROCSEG	3	/* number of per process descriptors */
+#define	NGDT		13	/* number of GDT entries required */
+/* #define	APM40SEG	8	/* APM segment 0x40 */
+
+#define	SELGDT	(0<<2)	/* selector is in gdt */
+#define	SELLDT	(1<<2)	/* selector is in ldt */
+
+#define	SELECTOR(i, t, p)	(((i)<<3) | (t) | (p))
+
+#define	NULLSEL	SELECTOR(NULLSEG, SELGDT, 0)
+/* these are replaced by XEN entries */
+#ifdef NOPE  // XXX investigate more
+#define	KDSEL	SELECTOR(KDSEG, SELGDT, 0)
+#define	KESEL	SELECTOR(KESEG, SELGDT, 0)
+#define	UESEL	SELECTOR(UESEG, SELGDT, 3)
+#define	UDSEL	SELECTOR(UDSEG, SELGDT, 3)
+/* comment out to make sure unused ... */
+
+#define	TSSSEL	SELECTOR(TSSSEG, SELGDT, 0)
+#define	APMCSEL 	SELECTOR(APMCSEG, SELGDT, 0)
+#define	APMCSEL16	SELECTOR(APMCSEG16, SELGDT, 0)
+#define	APMDSEL		SELECTOR(APMDSEG, SELGDT, 0)
+/* #define	APM40SEL	SELECTOR(APM40SEG, SELGDT, 0) */
+#else
+/* use the selectors that xen gives us */
+#define KESEL FLAT_KERNEL_CS
+#define KDSEL FLAT_KERNEL_DS
+#define UESEL FLAT_USER_CS
+#define UDSEL FLAT_USER_DS
+#endif
+
+/*
+ *  fields in segment descriptors
+ */
+#define	SEGDATA	(0x10<<8)	/* data/stack segment */
+#define	SEGEXEC	(0x18<<8)	/* executable segment */
+#define	SEGTSS	(0x9<<8)	/* TSS segment */
+#define	SEGCG	(0x0C<<8)	/* call gate */
+#define	SEGIG	(0x0E<<8)	/* interrupt gate */
+#define	SEGTG	(0x0F<<8)	/* trap gate */
+#define	SEGTYPE	(0x1F<<8)
+
+#define	SEGP	(1<<15)		/* segment present */
+#define	SEGPL(x) ((x)<<13)	/* priority level */
+#define	SEGB	(1<<22)		/* granularity 1==4k (for expand-down) */
+#define	SEGG	(1<<23)		/* granularity 1==4k (for other) */
+#define	SEGE	(1<<10)		/* expand down */
+#define	SEGW	(1<<9)		/* writable (for data/stack) */
+#define	SEGR	(1<<9)		/* readable (for code) */
+#define	SEGD	(1<<22)		/* default 1==32bit (for code) */
+
+/*
+ *  virtual MMU
+ */
+#define	PTEMAPMEM	(1024*1024)	
+#define	PTEPERTAB	(PTEMAPMEM/BY2PG)
+#define	SEGMAPSIZE	1984
+#define	SSEGMAPSIZE	16
+#define	PPN(x)		((x)&~(BY2PG-1))
+#define	PGOFF(x)		((x)&(BY2PG-1))
+
+/*
+ *  physical MMU
+ */
+#define	PTEVALID	(1<<0)
+#define	PTEWT		(1<<3)
+#define	PTEUNCACHED	(1<<4)
+#define	PTEWRITE	(1<<1)
+#define	PTERONLY	(0<<1)
+#define	PTEKERNEL	(0<<2)
+#define	PTEUSER		(1<<2)
+#define	PTESIZE		(1<<7)
+#define	PTEGLOBAL	(1<<8)
+
+/*
+ * Macros for calculating offsets within the page directory base
+ * and page tables. 
+ */
+#define PAX(va)		(paemode? ((ulong)(va)>>29) & 0x6 : 0)
+#define	PDX(va)		(paemode? (((ulong)(va))>>20) & 0x03FE : (((ulong)(va))>>22) & 0x03FF)
+#define	PTX(va)		(paemode? (((ulong)(va))>>11) & 0x03FE : (((ulong)(va))>>12) & 0x03FF)
+#define PDB(pdb,va)	(paemode? KADDR(MAPPN((pdb)[((ulong)(va)>>29) & 0x6])) : pdb)
+
+#define	getpgcolor(a)	0