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hv: shell: improve console to modify input easier

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1. make memcpy_erms as a public API; add a new one
  memcpy_erms_backwards, which supports to copy data from tail to head.

  2. improve to use right/left/home/end key to move cursor, and support
delete/backspace key to modify current input command.

Tracked-On: #7931
Signed-off-by: Minggui Cao <minggui.cao@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Minggui Cao
2022-07-20 13:15:32 +08:00
committed by acrnsi-robot
parent d5b2c82156
commit 83164d6030
4 changed files with 145 additions and 28 deletions
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11
hypervisor/arch/x86/lib/memory.c
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@@ -24,7 +24,7 @@ void *memset(void *base, uint8_t v, size_t n)
return base;
}
static inline void memcpy_erms(void *d, const void *s, size_t slen)
void memcpy_erms(void *d, const void *s, size_t slen)
{
asm volatile ("rep; movsb"
: "=&D"(d), "=&S"(s)
@@ -32,6 +32,15 @@ static inline void memcpy_erms(void *d, const void *s, size_t slen)
: "memory");
}
/* copy data from tail to head (backwards) with ERMS (Enhanced REP MOVSB/STOSB) */
void memcpy_erms_backwards(void *d, const void *s, size_t slen)
{
asm volatile ("std; rep; movsb; cld"
: "=&D"(d), "=&S"(s)
: "c"(slen), "0" (d), "1" (s)
: "memory");
}
/*
* @brief Copies at most slen bytes from src address to dest address, up to dmax.
*